-er a-a a-b a-i aaa aab aae aai aak aam aap aar ab- aba abb abe abi abk abm abp abr aea aeb aee aei aek aem aep aer ai- aia aib aie aii aik aim aip air aka akb ake aki akk akm akp akr ama amb ame ami amk amm amp amr ap- apa apb ape api apk apm app apr ar- ara arb are ari ark arm arp arr b-p baa bab bae bai bak bam bap bar bba bbb bbe bbi bbk bbm bbp bbr be- bea beb bee bei bek bem bep ber bi- bia bib bie bii bik bim bip bir bka bkb bke bkk bkm bkp bkr bma bmb bme bmi bmk bmm bmp bmr bpa bpb bpe bpi bpm bpp bpr bra brb bre bri brk brm brp brr eaa eab eae eai eak eam eap ear eba ebb ebe ebi ebk ebm ebp ebr eea eeb eee eek eem eep eer eia eib eie eii eik eim eip eir eka ekb eke eki ekp ekr em- ema emb eme emi emk emm emp emr ep- epa epb epe epi epm epp epr era erb ere eri erk erm erp err ia- iaa iab iae iai iam iap iar iba ibb ibe ibi ibk ibm ibp ibr ie- iea iee iei iek iem iep ier iia iib iie iii iim iip iir ika ikb ike iki ikk ikr im- ima imb ime imi imm imp ipa ipb ipe ipi ipm ipp ipr ir- ira irb ire iri irk irm irp irr ka- kaa kab kae kai kak kam kap kar kba kbb kbe kbi kbk kbm kbp kbr ke- kea keb kee kei kek kem kep ker kia kib kie kii kik kim kip kir kkb kke kki kkk kkm kkp kkr kma kmb kme kmi kmk kmm kmp kpa kpe kpi kpk kpm kpp kpr kra kri krk krp krr m-r maa mab mae mai mak mam map mar mba mbb mbe mbi mbk mbm mbp mbr mea meb mee mei mek mem mep mer mi- mia mib mie mii mik mim mip mir mka mkb mke mkk mkm mkp mkr mma mmb mme mmi mmk mmm mmp mmr mpa mpb mpe mpi mpk mpm mpp mpr mra mrb mre mri mrk mrm mrp mrr p-p paa pab pae pai pak pam pap par pba pbb pbe pbi pbk pbm pbp pbr pea peb pee pei pek pem pep per pia pib pie pii pik pim pip pir pka pkb pke pki pkm pkp pkr pma pmb pme pmi pmk pmm pmp pmr ppa ppb ppe ppi ppk ppm ppp ppr pra prb pre pri prk prm prp prr ra- raa rab rae rai rak ram rap rar rba rbb rbe rbi rbk rbm rbp rbr re- rea reb ree rei rek rem rep rer ria rib rie rii rik rim rip rir rkb rke rkk rkm rkp rma rmb rme rmi rmm rmp rmr rpa rpb rpe rpi rpk rpm rpp rpr rra rrb rri rrk rrm rrp rrr