Perhaps you should try some spelling variations:
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"coder relation data clustering problem" » "coder relation data covering problem" (Expand search), "coder relation data scattering problem" (Expand search), "border relation data clustering problem" (Expand search), "power relation data clustering problem" (Expand search), "order relation data clustering problem" (Expand search), "coder relational data clustering problem" (Expand search), "coder relative data clustering problem" (Expand search), "coder replication data clustering problem" (Expand search)

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