<informationTable xmlns="http://www.sec.gov/edgar/document/thirteenf/informationtable">		<infoTable>
			<nameOfIssuer>58.COM INC SPONSORED ADR REPSTG CL A</nameOfIssuer>
			<titleOfClass>COM</titleOfClass>
			<cusip>31680Q104</cusip>
			<value>1898</value>
			<shrsOrPrnAmt>
				<sshPrnamt>49501</sshPrnamt>
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			<investmentDiscretion>DFND</investmentDiscretion>
			<votingAuthority>
				<Sole>3541</Sole>
				<Shared>0</Shared>
				<None>45960</None>
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		<infoTable>
			<nameOfIssuer>ACADIA HEALTHCARE CO INC COM</nameOfIssuer>
			<titleOfClass>COM</titleOfClass>
			<cusip>00404A109</cusip>
			<value>8349</value>
			<shrsOrPrnAmt>
				<sshPrnamt>176397</sshPrnamt>
				<sshPrnamtType>SH</sshPrnamtType>
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			<investmentDiscretion>DFND</investmentDiscretion>
			<votingAuthority>
				<Sole>28795</Sole>
				<Shared>0</Shared>
				<None>147602</None>
			</votingAuthority>
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		<infoTable>
			<nameOfIssuer>ACADIA PHARMACEUTICALS INC</nameOfIssuer>
			<titleOfClass>COM</titleOfClass>
			<cusip>004225108</cusip>
			<value>51468</value>
			<shrsOrPrnAmt>
				<sshPrnamt>2059529</sshPrnamt>
				<sshPrnamtType>SH</sshPrnamtType>
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			<investmentDiscretion>DFND</investmentDiscretion>
			<votingAuthority>
				<Sole>549012</Sole>
				<Shared>0</Shared>
				<None>1510517</None>
			</votingAuthority>
		</infoTable>
		<infoTable>
			<nameOfIssuer>ADDUS HOMECARE CORPORATION</nameOfIssuer>
			<titleOfClass>COM</titleOfClass>
			<cusip>006739106</cusip>
			<value>1077</value>
			<shrsOrPrnAmt>
				<sshPrnamt>47991</sshPrnamt>
				<sshPrnamtType>SH</sshPrnamtType>
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			<investmentDiscretion>DFND</investmentDiscretion>
			<votingAuthority>
				<Sole>18992</Sole>
				<Shared>0</Shared>
				<None>28999</None>
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		<infoTable>
			<nameOfIssuer>AEROVIRONMENT INC</nameOfIssuer>
			<titleOfClass>COM</titleOfClass>
			<cusip>008073108</cusip>
			<value>6201</value>
			<shrsOrPrnAmt>
				<sshPrnamt>212814</sshPrnamt>
				<sshPrnamtType>SH</sshPrnamtType>
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			<investmentDiscretion>DFND</investmentDiscretion>
			<votingAuthority>
				<Sole>0</Sole>
				<Shared>0</Shared>
				<None>212814</None>
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		<infoTable>
			<nameOfIssuer>ALLEGIANT TRAVEL CO</nameOfIssuer>
			<titleOfClass>COM</titleOfClass>
			<cusip>01748X102</cusip>
			<value>18279</value>
			<shrsOrPrnAmt>
				<sshPrnamt>173359</sshPrnamt>
				<sshPrnamtType>SH</sshPrnamtType>
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			<investmentDiscretion>DFND</investmentDiscretion>
			<votingAuthority>
				<Sole>13978</Sole>
				<Shared>0</Shared>
				<None>159381</None>
			</votingAuthority>
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		<infoTable>
			<nameOfIssuer>ALNYLAM PHARMACEUTICALS INC</nameOfIssuer>
			<titleOfClass>COM</titleOfClass>
			<cusip>02043Q107</cusip>
			<value>122115</value>
			<shrsOrPrnAmt>
				<sshPrnamt>1899152</sshPrnamt>
				<sshPrnamtType>SH</sshPrnamtType>
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			<investmentDiscretion>DFND</investmentDiscretion>
			<votingAuthority>
				<Sole>410927</Sole>
				<Shared>0</Shared>
				<None>1488225</None>
			</votingAuthority>
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		<infoTable>
			<nameOfIssuer>AMAZON.COM INC</nameOfIssuer>
			<titleOfClass>COM</titleOfClass>
			<cusip>023135106</cusip>
			<value>275085</value>
			<shrsOrPrnAmt>
				<sshPrnamt>689800</sshPrnamt>
				<sshPrnamtType>SH</sshPrnamtType>
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			<investmentDiscretion>DFND</investmentDiscretion>
			<votingAuthority>
				<Sole>208541</Sole>
				<Shared>0</Shared>
				<None>481259</None>
			</votingAuthority>
		</infoTable>
		<infoTable>
			<nameOfIssuer>AMERICAN INTERNATIONAL GROUP INC</nameOfIssuer>
			<titleOfClass>COM</titleOfClass>
			<cusip>026874784</cusip>
			<value>49144</value>
			<shrsOrPrnAmt>
				<sshPrnamt>962664</sshPrnamt>
				<sshPrnamtType>SH</sshPrnamtType>
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			<investmentDiscretion>DFND</investmentDiscretion>
			<votingAuthority>
				<Sole>121823</Sole>
				<Shared>0</Shared>
				<None>840841</None>
			</votingAuthority>
		</infoTable>
		<infoTable>
			<nameOfIssuer>AMERICAN TOWER CORPORATION REIT</nameOfIssuer>
			<titleOfClass>COM</titleOfClass>
			<cusip>03027X100</cusip>
			<value>8009</value>
			<shrsOrPrnAmt>
				<sshPrnamt>100333</sshPrnamt>
				<sshPrnamtType>SH</sshPrnamtType>
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			<investmentDiscretion>DFND</investmentDiscretion>
			<votingAuthority>
				<Sole>7487</Sole>
				<Shared>0</Shared>
				<None>92846</None>
			</votingAuthority>
		</infoTable>
		<infoTable>
			<nameOfIssuer>AMIRA NATURE FOODS LTD</nameOfIssuer>
			<titleOfClass>COM</titleOfClass>
			<cusip>G0335L102</cusip>
			<value>4767</value>
			<shrsOrPrnAmt>
				<sshPrnamt>302497</sshPrnamt>
				<sshPrnamtType>SH</sshPrnamtType>
			</shrsOrPrnAmt>
			<investmentDiscretion>DFND</investmentDiscretion>
			<votingAuthority>
				<Sole>10165</Sole>
				<Shared>0</Shared>
				<None>292332</None>
			</votingAuthority>
		</infoTable>
		<infoTable>
			<nameOfIssuer>AON PLC SHS CL A</nameOfIssuer>
			<titleOfClass>COM</titleOfClass>
			<cusip>G0408V102</cusip>
			<value>42</value>
			<shrsOrPrnAmt>
				<sshPrnamt>499</sshPrnamt>
				<sshPrnamtType>SH</sshPrnamtType>
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			<investmentDiscretion>DFND</investmentDiscretion>
			<votingAuthority>
				<Sole>193</Sole>
				<Shared>0</Shared>
				<None>306</None>
			</votingAuthority>
		</infoTable>
		<infoTable>
			<nameOfIssuer>APACHE CORP</nameOfIssuer>
			<titleOfClass>COM</titleOfClass>
			<cusip>037411105</cusip>
			<value>4828</value>
			<shrsOrPrnAmt>
				<sshPrnamt>56182</sshPrnamt>
				<sshPrnamtType>SH</sshPrnamtType>
			</shrsOrPrnAmt>
			<investmentDiscretion>DFND</investmentDiscretion>
			<votingAuthority>
				<Sole>4230</Sole>
				<Shared>0</Shared>
				<None>51952</None>
			</votingAuthority>
		</infoTable>
		<infoTable>
			<nameOfIssuer>APPLE INC</nameOfIssuer>
			<titleOfClass>COM</titleOfClass>
			<cusip>037833100</cusip>
			<value>2715</value>
			<shrsOrPrnAmt>
				<sshPrnamt>4840</sshPrnamt>
				<sshPrnamtType>SH</sshPrnamtType>
			</shrsOrPrnAmt>
			<investmentDiscretion>DFND</investmentDiscretion>
			<votingAuthority>
				<Sole>1013</Sole>
				<Shared>0</Shared>
				<None>3827</None>
			</votingAuthority>
		</infoTable>
		<infoTable>
			<nameOfIssuer>ARM HLDGS ORD GBP0.0005</nameOfIssuer>
			<titleOfClass>COM</titleOfClass>
			<cusip>000000000</cusip>
			<value>130514</value>
			<shrsOrPrnAmt>
				<sshPrnamt>7188218</sshPrnamt>
				<sshPrnamtType>SH</sshPrnamtType>
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			<investmentDiscretion>DFND</investmentDiscretion>
			<votingAuthority>
				<Sole>1170125</Sole>
				<Shared>0</Shared>
				<None>6018093</None>
			</votingAuthority>
		</infoTable>
		<infoTable>
			<nameOfIssuer>ASTRONICS CORP</nameOfIssuer>
			<titleOfClass>COM</titleOfClass>
			<cusip>046433108</cusip>
			<value>1403</value>
			<shrsOrPrnAmt>
				<sshPrnamt>27510</sshPrnamt>
				<sshPrnamtType>SH</sshPrnamtType>
			</shrsOrPrnAmt>
			<investmentDiscretion>DFND</investmentDiscretion>
			<votingAuthority>
				<Sole>2405</Sole>
				<Shared>0</Shared>
				<None>25105</None>
			</votingAuthority>
		</infoTable>
		<infoTable>
			<nameOfIssuer>ATHENAHEALTH INC</nameOfIssuer>
			<titleOfClass>COM</titleOfClass>
			<cusip>04685W103</cusip>
			<value>3397</value>
			<shrsOrPrnAmt>
				<sshPrnamt>25254</sshPrnamt>
				<sshPrnamtType>SH</sshPrnamtType>
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			<investmentDiscretion>DFND</investmentDiscretion>
			<votingAuthority>
				<Sole>5928</Sole>
				<Shared>0</Shared>
				<None>19326</None>
			</votingAuthority>
		</infoTable>
		<infoTable>
			<nameOfIssuer>AUGUSTA RESOURCE CORP</nameOfIssuer>
			<titleOfClass>COM</titleOfClass>
			<cusip>050912203</cusip>
			<value>4103</value>
			<shrsOrPrnAmt>
				<sshPrnamt>2892068</sshPrnamt>
				<sshPrnamtType>SH</sshPrnamtType>
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			<investmentDiscretion>DFND</investmentDiscretion>
			<votingAuthority>
				<Sole>301790</Sole>
				<Shared>0</Shared>
				<None>2590278</None>
			</votingAuthority>
		</infoTable>
		<infoTable>
			<nameOfIssuer>AVIS BUDGET GROUP INC</nameOfIssuer>
			<titleOfClass>COM</titleOfClass>
			<cusip>053774105</cusip>
			<value>80306</value>
			<shrsOrPrnAmt>
				<sshPrnamt>1986786</sshPrnamt>
				<sshPrnamtType>SH</sshPrnamtType>
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			<investmentDiscretion>DFND</investmentDiscretion>
			<votingAuthority>
				<Sole>107300</Sole>
				<Shared>0</Shared>
				<None>1879486</None>
			</votingAuthority>
		</infoTable>
		<infoTable>
			<nameOfIssuer>AVIV REIT INC</nameOfIssuer>
			<titleOfClass>COM</titleOfClass>
			<cusip>05381L101</cusip>
			<value>1640</value>
			<shrsOrPrnAmt>
				<sshPrnamt>69187</sshPrnamt>
				<sshPrnamtType>SH</sshPrnamtType>
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			<investmentDiscretion>DFND</investmentDiscretion>
			<votingAuthority>
				<Sole>17353</Sole>
				<Shared>0</Shared>
				<None>51834</None>
			</votingAuthority>
		</infoTable>
		<infoTable>
			<nameOfIssuer>BAIDU INC SPONSORED ADR REPSTG ORD SHS</nameOfIssuer>
			<titleOfClass>COM</titleOfClass>
			<cusip>056752108</cusip>
			<value>9835</value>
			<shrsOrPrnAmt>
				<sshPrnamt>55290</sshPrnamt>
				<sshPrnamtType>SH</sshPrnamtType>
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			<investmentDiscretion>DFND</investmentDiscretion>
			<votingAuthority>
				<Sole>9407</Sole>
				<Shared>0</Shared>
				<None>45883</None>
			</votingAuthority>
		</infoTable>
		<infoTable>
			<nameOfIssuer>BEBE STORES INC</nameOfIssuer>
			<titleOfClass>COM</titleOfClass>
			<cusip>075571109</cusip>
			<value>13136</value>
			<shrsOrPrnAmt>
				<sshPrnamt>2469172</sshPrnamt>
				<sshPrnamtType>SH</sshPrnamtType>
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			<investmentDiscretion>DFND</investmentDiscretion>
			<votingAuthority>
				<Sole>36806</Sole>
				<Shared>0</Shared>
				<None>2432366</None>
			</votingAuthority>
		</infoTable>
		<infoTable>
			<nameOfIssuer>BELLATRIX EXPLORATION LTD</nameOfIssuer>
			<titleOfClass>COM</titleOfClass>
			<cusip>078314101</cusip>
			<value>14409</value>
			<shrsOrPrnAmt>
				<sshPrnamt>1963738</sshPrnamt>
				<sshPrnamtType>SH</sshPrnamtType>
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			<investmentDiscretion>DFND</investmentDiscretion>
			<votingAuthority>
				<Sole>111047</Sole>
				<Shared>0</Shared>
				<None>1852691</None>
			</votingAuthority>
		</infoTable>
		<infoTable>
			<nameOfIssuer>BERKLEY W R CORPORATION</nameOfIssuer>
			<titleOfClass>COM</titleOfClass>
			<cusip>084423102</cusip>
			<value>37761</value>
			<shrsOrPrnAmt>
				<sshPrnamt>870268</sshPrnamt>
				<sshPrnamtType>SH</sshPrnamtType>
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			<investmentDiscretion>DFND</investmentDiscretion>
			<votingAuthority>
				<Sole>409083</Sole>
				<Shared>0</Shared>
				<None>461185</None>
			</votingAuthority>
		</infoTable>
		<infoTable>
			<nameOfIssuer>BIOMARIN PHARMACEUTICAL INC</nameOfIssuer>
			<titleOfClass>COM</titleOfClass>
			<cusip>09061G101</cusip>
			<value>79407</value>
			<shrsOrPrnAmt>
				<sshPrnamt>1128735</sshPrnamt>
				<sshPrnamtType>SH</sshPrnamtType>
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			<investmentDiscretion>DFND</investmentDiscretion>
			<votingAuthority>
				<Sole>463401</Sole>
				<Shared>0</Shared>
				<None>665334</None>
			</votingAuthority>
		</infoTable>
		<infoTable>
			<nameOfIssuer>BIOSCRIP INC</nameOfIssuer>
			<titleOfClass>COM</titleOfClass>
			<cusip>09069N108</cusip>
			<value>29060</value>
			<shrsOrPrnAmt>
				<sshPrnamt>3927009</sshPrnamt>
				<sshPrnamtType>SH</sshPrnamtType>
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			<investmentDiscretion>DFND</investmentDiscretion>
			<votingAuthority>
				<Sole>934218</Sole>
				<Shared>0</Shared>
				<None>2992791</None>
			</votingAuthority>
		</infoTable>
		<infoTable>
			<nameOfIssuer>BLACK DIAMOND INC</nameOfIssuer>
			<titleOfClass>COM</titleOfClass>
			<cusip>09202G101</cusip>
			<value>3043</value>
			<shrsOrPrnAmt>
				<sshPrnamt>228276</sshPrnamt>
				<sshPrnamtType>SH</sshPrnamtType>
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			<investmentDiscretion>DFND</investmentDiscretion>
			<votingAuthority>
				<Sole>7179</Sole>
				<Shared>0</Shared>
				<None>221097</None>
			</votingAuthority>
		</infoTable>
		<infoTable>
			<nameOfIssuer>BLACKHAWK NETWORK HOLDINGS INC CLASS A</nameOfIssuer>
			<titleOfClass>COM</titleOfClass>
			<cusip>09238E104</cusip>
			<value>10835</value>
			<shrsOrPrnAmt>
				<sshPrnamt>428920</sshPrnamt>
				<sshPrnamtType>SH</sshPrnamtType>
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			<investmentDiscretion>DFND</investmentDiscretion>
			<votingAuthority>
				<Sole>17760</Sole>
				<Shared>0</Shared>
				<None>411160</None>
			</votingAuthority>
		</infoTable>
		<infoTable>
			<nameOfIssuer>BLUELINX HOLDINGS INC</nameOfIssuer>
			<titleOfClass>COM</titleOfClass>
			<cusip>09624H109</cusip>
			<value>102</value>
			<shrsOrPrnAmt>
				<sshPrnamt>52229</sshPrnamt>
				<sshPrnamtType>SH</sshPrnamtType>
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			<investmentDiscretion>DFND</investmentDiscretion>
			<votingAuthority>
				<Sole>4910</Sole>
				<Shared>0</Shared>
				<None>47319</None>
			</votingAuthority>
		</infoTable>
		<infoTable>
			<nameOfIssuer>BOFI HOLDING INC</nameOfIssuer>
			<titleOfClass>COM</titleOfClass>
			<cusip>05566U108</cusip>
			<value>35431</value>
			<shrsOrPrnAmt>
				<sshPrnamt>451758</sshPrnamt>
				<sshPrnamtType>SH</sshPrnamtType>
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			<investmentDiscretion>DFND</investmentDiscretion>
			<votingAuthority>
				<Sole>62940</Sole>
				<Shared>0</Shared>
				<None>388818</None>
			</votingAuthority>
		</infoTable>
		<infoTable>
			<nameOfIssuer>BOSTON BEER CO INC-CL A</nameOfIssuer>
			<titleOfClass>COM</titleOfClass>
			<cusip>100557107</cusip>
			<value>58595</value>
			<shrsOrPrnAmt>
				<sshPrnamt>242340</sshPrnamt>
				<sshPrnamtType>SH</sshPrnamtType>
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			<investmentDiscretion>DFND</investmentDiscretion>
			<votingAuthority>
				<Sole>10419</Sole>
				<Shared>0</Shared>
				<None>231921</None>
			</votingAuthority>
		</infoTable>
		<infoTable>
			<nameOfIssuer>BOSTON SCIENTIFIC CORP</nameOfIssuer>
			<titleOfClass>COM</titleOfClass>
			<cusip>101137107</cusip>
			<value>88375</value>
			<shrsOrPrnAmt>
				<sshPrnamt>7352321</sshPrnamt>
				<sshPrnamtType>SH</sshPrnamtType>
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			<investmentDiscretion>DFND</investmentDiscretion>
			<votingAuthority>
				<Sole>1706176</Sole>
				<Shared>0</Shared>
				<None>5646145</None>
			</votingAuthority>
		</infoTable>
		<infoTable>
			<nameOfIssuer>BURGER KING WORLDWIDE INC</nameOfIssuer>
			<titleOfClass>COM</titleOfClass>
			<cusip>121220107</cusip>
			<value>433</value>
			<shrsOrPrnAmt>
				<sshPrnamt>18928</sshPrnamt>
				<sshPrnamtType>SH</sshPrnamtType>
			</shrsOrPrnAmt>
			<investmentDiscretion>DFND</investmentDiscretion>
			<votingAuthority>
				<Sole>9512</Sole>
				<Shared>0</Shared>
				<None>9416</None>
			</votingAuthority>
		</infoTable>
		<infoTable>
			<nameOfIssuer>CABELAS INC</nameOfIssuer>
			<titleOfClass>COM</titleOfClass>
			<cusip>126804301</cusip>
			<value>2694</value>
			<shrsOrPrnAmt>
				<sshPrnamt>40407</sshPrnamt>
				<sshPrnamtType>SH</sshPrnamtType>
			</shrsOrPrnAmt>
			<investmentDiscretion>DFND</investmentDiscretion>
			<votingAuthority>
				<Sole>9559</Sole>
				<Shared>0</Shared>
				<None>30848</None>
			</votingAuthority>
		</infoTable>
		<infoTable>
			<nameOfIssuer>CAESARSTONE SDOT-YAM LTD</nameOfIssuer>
			<titleOfClass>COM</titleOfClass>
			<cusip>M20598104</cusip>
			<value>3144</value>
			<shrsOrPrnAmt>
				<sshPrnamt>63290</sshPrnamt>
				<sshPrnamtType>SH</sshPrnamtType>
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			<investmentDiscretion>DFND</investmentDiscretion>
			<votingAuthority>
				<Sole>12878</Sole>
				<Shared>0</Shared>
				<None>50412</None>
			</votingAuthority>
		</infoTable>
		<infoTable>
			<nameOfIssuer>CALAMP CORP</nameOfIssuer>
			<titleOfClass>COM</titleOfClass>
			<cusip>128126109</cusip>
			<value>15661</value>
			<shrsOrPrnAmt>
				<sshPrnamt>559914</sshPrnamt>
				<sshPrnamtType>SH</sshPrnamtType>
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			<investmentDiscretion>DFND</investmentDiscretion>
			<votingAuthority>
				<Sole>76153</Sole>
				<Shared>0</Shared>
				<None>483761</None>
			</votingAuthority>
		</infoTable>
		<infoTable>
			<nameOfIssuer>CANTEL MEDICAL CORPORATION</nameOfIssuer>
			<titleOfClass>COM</titleOfClass>
			<cusip>138098108</cusip>
			<value>793</value>
			<shrsOrPrnAmt>
				<sshPrnamt>23398</sshPrnamt>
				<sshPrnamtType>SH</sshPrnamtType>
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			<nameOfIssuer>CHICAGO BRIDGE &amp; IRON CO NV</nameOfIssuer>
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			<nameOfIssuer>CONTAINER STORE GROUP INC (THE)</nameOfIssuer>
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			<nameOfIssuer>COPA HOLDINGS S A CL A</nameOfIssuer>
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			<nameOfIssuer>COSTAR GROUP INC</nameOfIssuer>
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			<nameOfIssuer>CRITEO S A SPONSORED ADS</nameOfIssuer>
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			<nameOfIssuer>ISHARES MSCI MEXICO CAPPED ETF</nameOfIssuer>
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			<nameOfIssuer>QIWI PLC SPONSORED ADR REPSTG CL B</nameOfIssuer>
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			<nameOfIssuer>QUNAR CAYMAN ISLANDS LIMITED AMERICAN DEPOSITARY SHARES</nameOfIssuer>
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			<nameOfIssuer>REALOGY HOLDINGS CORP COM</nameOfIssuer>
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			<nameOfIssuer>REGIONAL MANAGEMENT CORP</nameOfIssuer>
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