pfe[8], ref[7], cep[5], ber[5], erb[5], reb[5], web[5], cer[4], per[4], rep[4], cew[4], rew[3], wre[3],
ef[6], fe[6], be[4], ce[3], pe[3], er[2], re[2], ew[2], we[2],
