opeer[6],
rebe[6], bero[6], ober[6], oper[5], pero[5], oere[4],
bee[5], ber[5], erb[5], reb[5], bor[5], rob[5], per[4], rep[4], por[4], pro[4], rop[4], ero[3],
be[4], bo[4], pe[3], op[3], po[3], ee[2], eo[2], er[2], re[2], or[2], ro[2],
