-er a-a a-b a-i a-t aaa aab aae aai aak aap aar aat ab- aba abb abe abi abk abp abr abt aea aeb aee aei aek aep aer aet ai- aia aib aie aii aik aip air ait aka akb ake aki akk akp akr ap- apa apb ape api apk app apr apt ar- ara arb are ari ark arp arr art at- ata atb ate ati atp atr att b-p baa bab bae bai bak bap bar bat bba bbb bbe bbi bbk bbp bbr bbt be- bea beb bee bei bek bep ber bet bi- bia bib bie bii bik bip bir bit bka bkb bke bkk bkp bkr bkt bpa bpb bpe bpi bpp bpr bpt bra brb bre bri brk brp brr brt bta btb bte bti btk btp btr btt eaa eab eae eai eak eap ear eat eba ebb ebe ebi ebk ebp ebr ebt eea eeb eee eek eep eer eet eia eib eie eii eik eip eir eit eka ekb eke eki ekp ekr ekt ep- epa epb epe epi epp epr ept era erb ere eri erk erp err ert eta etb ete eti etk etp etr ett ia- iaa iab iae iai iap iar iat iba ibb ibe ibi ibk ibp ibr ibt ie- iea iee iei iek iep ier iet iia iib iie iii iip iir iit ika ikb ike iki ikk ikr ikt ipa ipb ipe ipi ipp ipr ipt ir- ira irb ire iri irk irp irr irt ita itb ite iti itk itp itt k-t ka- kaa kab kae kai kak kap kar kat kba kbb kbe kbi kbk kbp kbr ke- kea keb kee kei kek kep ker ket kia kib kie kii kik kip kir kit kkb kke kki kkk kkp kkr kkt kpa kpe kpi kpk kpp kpr kpt kra kri krk krp krr krt kta ktb kte ktk ktp ktr ktt p-p paa pab pae pai pak pap par pat pba pbb pbe pbi pbk pbp pbr pbt pea peb pee pei pek pep per pet pia pib pie pii pik pip pir pit pka pkb pke pki pkp pkr pkt ppa ppb ppe ppi ppk ppp ppr ppt pra prb pre pri prk prp prr prt pt- pta ptb pte pti ptk ptp ptr ptt ra- raa rab rae rai rak rap rar rat rba rbb rbe rbi rbk rbp rbr rbt re- rea reb ree rei rek rep rer ret ria rib rie rii rik rip rir rit rkb rke rkk rkp rkt rpa rpb rpe rpi rpk rpp rpr rpt rra rrb rri rrk rrp rrr rrt rta rtb rte rti rtk rtp rtr rtt taa tab tae tai tak tap tar tat tba tbb tbe tbi tbk tbp tbr tbt te- tea teb tee tei tek tep ter tet tia tib tie tii tik tip tir tit tka tkb tke tkk tkp tkr tkt tpa tpb tpe tpi tpk tpp tpr tpt tra trb tre tri trk trp trr trt tta ttb tte tti ttk ttp ttr ttt