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use strict;
use warnings;
...
    }
    return $ret;
}

204 [0,1] 205 [2,0] 206 [2,1] 207 [3,0]
205 [2,0] 206 [2,1] 207 [3,0] 208 [0,2]
312 [0,3] 313 [1,1] 314 [3,2] 315 [2,2]