def _scan(positions):
scores = []<EOL>for start in range(<NUM_LIT:0>, len(positions) - <NUM_LIT>, <NUM_LIT:5>):<EOL><INDENT>end = start = <NUM_LIT><EOL>scores.add(_enrichment(positions[start:end], positions[:start], positions[end:]))<EOL><DEDENT>
get the region inside the vector with more expression