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  DB<33> x @a=(0,1,1); grep { (each @a)[1] } A..L
0  'B'
...
3  'G'
4  'J'
5  'K'

  DB<34> x @a=(0,0,1,1); grep { (each @a)[1] // (each @a)[1] } A..L
0  'C'
...
3  'H'
4  'K'
5  'L'