power[11], powre[11], opern[9], poren[9], repro[9],
oper[8], pore[8],
epo[7], pro[7], per[6], rep[6], won[6], wen[5], wer[5], ern[3], ren[3],
po[6], wo[5], on[3], ne[2], er[2], re[2],