pfe[8], efo[7], ref[7], for[7], orf[7], hep[6], hop[6], her[5], hor[5], rho[5], per[4], rep[4], por[4], pro[4], rop[4], ero[3],
ef[6], fe[6], eh[4], he[4], ho[4], oh[4], pe[3], op[3], po[3], eo[2], er[2], re[2], or[2], ro[2],
