bi in is nu si un us
bin bis bun bur bus ins nib nub nus rib rin rub run sib sin sir sri sub sun uns urb urn
bins brin bris buns burn burs nibs nubs ribs rins rubs ruin runs snib snub urbs urns
brins bruin burin burns ruins
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Algunas palabras al azar: wasps washy warty warts warps