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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def from_gtp(gtpc):
 """Converts from a GTP coordinate to a Minigo coordinate."""

    gtpc = gtpc.upper()
    if gtpc == 'PASS':
        return None
    col = _GTP_COLUMNS.index(gtpc[0])
    row_from_bottom = int(gtpc[1:])
    return go.N - row_from_bottom, col