-er a-a a-i aaa aae aai aao aap aar aea aee aei aeo aep aer ai- aia aie aii aio aip air aoa aoe aoi aoo aop aor ap- apa ape api apo app apr ar- ara are ari aro arp arr eaa eae eai eao eap ear eea eee eeo eep eer eia eie eii eio eip eir eo- eoa eoe eoi eoo eop eor ep- epa epe epi epo epp epr era ere eri ero erp err ia- iaa iae iai iao iap iar ie- iea iee iei iep ier iia iie iii iio iip iir io- ioa ioe ioi ioo iop ior ipa ipe ipi ipo ipp ipr ir- ira ire iri iro irp irr o-i oaa oae oai oao oap oar oea oee oei oeo oep oer oia oie oii oio oip oir oo- ooa ooi ooo oop oor op- opa ope opi opo opp opr or- ora ore ori oro orp orr p-p paa pae pai pao pap par pea pee pei peo pep per pia pie pii pio pip pir poa poe poi poo pop por ppa ppe ppi ppo ppp ppr pra pre pri pro prp prr ra- raa rae rai rao rap rar re- rea ree rei reo rep rer ria rie rii rio rip rir roa roe roi roo rop ror rpa rpe rpi rpo rpp rpr rra rri rrp rrr