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    <link:label id="lab_xon_PreferredStockDividendRatePerDollarAmountUnconvertedShares_2071C8E07DCE000A307801C5AB64B4AF_documentation_en-US" xlink:label="lab_xon_PreferredStockDividendRatePerDollarAmountUnconvertedShares_2071C8E07DCE000A307801C5AB64B4AF" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">The amount per share used to calculate dividend payments on preferred stock for unconverted shares after a conversion event.</link:label>
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    <link:label id="lab_xon_ConvertiblePreferredSharesSharesIssued_F022550FFE5FD9DF898701C5AB647889_label_en-US" xlink:label="lab_xon_ConvertiblePreferredSharesSharesIssued_F022550FFE5FD9DF898701C5AB647889" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Convertible Preferred Shares, Shares Issued</link:label>
    <link:label id="lab_xon_ConvertiblePreferredSharesSharesIssued_F022550FFE5FD9DF898701C5AB647889_documentation_en-US" xlink:label="lab_xon_ConvertiblePreferredSharesSharesIssued_F022550FFE5FD9DF898701C5AB647889" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Total number of convertible preferred shares issued to shareholders. May be all or portion of the number of convertible preferred shares authorized.</link:label>
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    <link:label id="lab_xon_WarrantsNumberOfCommonSharesIntoWhichWarrantsCanBeConverted_9AA0D778571F4160234901C5AB646267_documentation_en-US" xlink:label="lab_xon_WarrantsNumberOfCommonSharesIntoWhichWarrantsCanBeConverted_9AA0D778571F4160234901C5AB646267" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">The number of common shares into which warrants can be converted.</link:label>
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    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_StockholdersEquityReverseStockSplit" xlink:label="loc_us-gaap_StockholdersEquityReverseStockSplit_99D5F59D99758AF0045801C5AB640FC6" xlink:type="locator" />
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    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_StockholdersEquityNoteStockSplitConversionRatio1" xlink:label="loc_us-gaap_StockholdersEquityNoteStockSplitConversionRatio1_6A8E6460F417CC8B0B1301C5AB641B01" xlink:type="locator" />
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    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_PreferredStockDividendRatePercentage" xlink:label="loc_us-gaap_PreferredStockDividendRatePercentage_5EF60888ED1A279C12FA01C5AB6463A7" xlink:type="locator" />
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    <link:label id="lab_xon_AssetConversionOriginalAssetAmount_1302AE42CAF22F0C8B6601C5AB640018_documentation_en-US" xlink:label="lab_xon_AssetConversionOriginalAssetAmount_1302AE42CAF22F0C8B6601C5AB640018" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">The amount of the original asset being converted in a noncash transaction.</link:label>
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    <link:label id="lab_xon_PreferredStockInitialDividendRatePercentage_E04231F833BEF41E6D2C01C5AB649179_documentation_en-US" xlink:label="lab_xon_PreferredStockInitialDividendRatePercentage_E04231F833BEF41E6D2C01C5AB649179" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">The initial percentage rate used to calculate dividend payments on preferred stock applicable for an initial defined period.</link:label>
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    <link:label id="lab_us-gaap_ShareBasedCompensation_A67B825CCF82AA03F4A02069F15BC7CD_label_en-US" xlink:label="lab_us-gaap_ShareBasedCompensation_A67B825CCF82AA03F4A02069F15BC7CD" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Share-based Compensation</link:label>
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    <link:label id="lab_xon_SharesIssuedDuringPeriodValueIssuedForServicesExpense_367338415604AA941EAC2069F15BEA25_terseLabel_en-US" xlink:label="lab_xon_SharesIssuedDuringPeriodValueIssuedForServicesExpense_367338415604AA941EAC2069F15BEA25" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Shares issued as payment for services</link:label>
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    <link:label id="lab_us-gaap_ProvisionForDoubtfulAccounts_5D27A00BC58D8E1484CE2069F15B35F8_terseLabel_en-US" xlink:label="lab_us-gaap_ProvisionForDoubtfulAccounts_5D27A00BC58D8E1484CE2069F15B35F8" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Provision for bad debts</link:label>
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