-er a-a aaa aae aak aan aao aap aar aea aee aek aen aeo aep aer aka ake akk akn ako akp akr an- ana ane ank ann ano anp anr aoa aoe aok aon aoo aop aor ap- apa ape apk apn apo app apr ar- ara are ark arn aro arp arr eaa eae eak ean eao eap ear eea eee eek een eeo eep eer eka eke eko ekp ekr en- ena ene enk enn eno enp enr eo- eoa eoe eok eon eoo eop eor ep- epa epe epn epo epp epr era ere erk ern ero erp err ka- kaa kae kak kan kao kap kar ke- kea kee kek ken keo kep ker kke kkk kkn kkp kkr kn- kna kne knk knn kno knp knr koa koe kok kon koo kop kor kpa kpe kpk kpn kpo kpp kpr kra krk krn kro krp krr naa nae nak nan nao nap nar ne- nea nee nek nen neo nep ner nka nke nkk nkn nko nkp nkr nna nne nnk nnn nno nnp no- noa noe nok non noo nop nor npa npe npn npo npp npr nra nre nrk nrn nro nrp nrr oaa oae oak oan oao oap oar oea oee oen oeo oep oer oka oke okk oko okp okr on- ona one onk onn ono onp onr oo- ooa ook oon ooo oop oor op- opa ope opk opn opo opp opr or- ora ore ork orn oro orp orr p-p paa pae pak pan pao pap par pea pee pek pen peo pep per pka pke pkn pko pkp pkr pn- pna pne pnk pnn pno pnp pnr poa poe pok pon poo pop por ppa ppe ppk ppn ppo ppp ppr pra pre prk prn pro prp prr ra- raa rae rak ran rao rap rar re- rea ree rek ren reo rep rer rke rkk rko rkp rna rnn rno rnp rnr roa roe rok ron roo rop ror rpa rpe rpk rpn rpo rpp rpr rra rrk rrn rrp rrr