-er a-a a-t aaa aae aan aap aar aat aax aea aee aen aep aer aet aex an- ana ane ann anp anr ant anx ap- apa ape apn app apr apt apx ar- ara are arn arp arr art arx at- ata ate atn atp atr att atx ax- axa axe axn axp axr axt axx eaa eae ean eap ear eat eax eea eee een eep eer eet eex en- ena ene enn enp enr ent ep- epa epe epn epp epr ept epx era ere ern erp err ert eta ete etn etp etr ett etx ex- exa exe exp exr ext exx naa nae nan nap nar nat nax ne- nea nee nen nep ner net nex nna nne nnn nnp nnt npa npe npn npp npr npt nra nre nrn nrp nrr nrt nrx nta nte ntn ntp ntr ntt ntx nxt p-p paa pae pan pap par pat pax pea pee pen pep per pet pex pn- pna pne pnn pnp pnr pnt pnx ppa ppe ppn ppp ppr ppt ppx pra pre prn prp prr prt prx pt- pta pte ptn ptp ptr ptt ptx pxe pxr pxt ra- raa rae ran rap rar rat rax re- rea ree ren rep rer ret rex rna rnn rnp rnr rnt rpa rpe rpn rpp rpr rpt rpx rra rrn rrp rrr rrt rta rte rtn rtp rtr rtt rtx rxp rxr t-x taa tae tan tap tar tat tax te- tea tee ten tep ter tet tex tna tne tnn tnp tnr tnt tnx tpa tpe tpn tpp tpr tpt tpx tra tre trn trp trr trt trx tta tte ttn ttp ttr ttt ttx txe txn txt xaa xan xap xar xat xee xen xep xer xet xex xna xpa xpe xpn xpp xpt xrt xrx xtp xtr xtx xxp xxx