Perhaps you should try some spelling variations:
coder approximation » power approximation (Expand search), model approximation (Expand search), order approximation (Expand search)
approximation to » approximation of (Expand search), approximation _ (Expand search), approximation theory (Expand search)
coding program » cloning program (Expand search), loading program (Expand search), cooling programs (Expand search)
python python » pythons python (Expand search), piton python (Expand search), pitons python (Expand search)
to coding » to crowding (Expand search), otto coding (Expand search), non coding (Expand search)
in python » _ python (Expand search)

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• The words AND, OR and NOT may confuse the search; try adding quotes: "(( coder approximation to coding program ) OR ( in python python python programming ))~".
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