-er eee eel eep eer eex ele ell elp elr elx ep- epe epl epp epq epr epx eqe eqp eqq ere erl erp erq err ex- exe exl exp exr exx l-p lee lel lep leq ler lex lle lll llp llq llr lpe lpl lpp lpr lpx lqr lrp lrr lxr lxx p-p pee pel pep per pex ple pll plp plr plx ppe ppl ppp ppq ppr ppx pqq pqr pre prl prp prq prr prx pxe pxl pxr qee qep qex qlp qpl qpp qpr qqq qre qrl qrp qxe qxl re- ree rel rep req rer rex rle rll rlp rlr rpe rpl rpp rpr rpx rrl rrp rrq rrr rxp rxr xee xel xep xeq xer xex xlr xpe xpl xpp xql xrx xxl xxp xxx