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        <link:usedOn>link:calculationLink</link:usedOn>
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        <link:usedOn>link:calculationLink</link:usedOn>
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        <link:usedOn>link:calculationLink</link:usedOn>
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        <link:usedOn>link:calculationLink</link:usedOn>
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        <link:definition>40201 - Disclosure - SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Changes in contract assets and liabilities (Details)</link:definition>
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        <link:definition>40202 - Disclosure - SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Accounts receivable (Details)</link:definition>
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        <link:definition>40402 - Disclosure - INCOME (LOSS) PER SHARE - Reconciliation of basic net loss to diluted net loss per share (Details)</link:definition>
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