-er b-p bbb bbe bbi bbk bbp bbr bbt be- beb bee bei bek bep ber bet bi- bib bie bii bik bip bir bit bkb bke bkk bkp bkr bkt bpb bpe bpi bpp bpr bpt brb bre bri brk brp brr brt btb bte bti btk btp btr btt ebb ebe ebi ebk ebp ebr ebt eeb eee eek eep eer eet eib eie eii eik eip eir eit ekb eke eki ekp ekr ekt ep- epb epe epi epp epr ept erb ere eri erk erp err ert etb ete eti etk etp etr ett ibb ibe ibi ibk ibp ibr ibt ie- iee iei iek iep ier iet iib iie iii iip iir iit ikb ike iki ikk ikr ikt ipb ipe ipi ipp ipr ipt ir- irb ire iri irk irp irr irt itb ite iti itk itp itt k-t kbb kbe kbi kbk kbp kbr ke- keb kee kei kek kep ker ket kib kie kii kik kip kir kit kkb kke kki kkk kkp kkr kkt kpe kpi kpk kpp kpr kpt kri krk krp krr krt ktb kte ktk ktp ktr ktt p-p pbb pbe pbi pbk pbp pbr pbt peb pee pei pek pep per pet pib pie pii pik pip pir pit pkb pke pki pkp pkr pkt ppb ppe ppi ppk ppp ppr ppt prb pre pri prk prp prr prt pt- ptb pte pti ptk ptp ptr ptt rbb rbe rbi rbk rbp rbr rbt re- reb ree rei rek rep rer ret rib rie rii rik rip rir rit rkb rke rkk rkp rkt rpb rpe rpi rpk rpp rpr rpt rrb rri rrk rrp rrr rrt rtb rte rti rtk rtp rtr rtt tbb tbe tbi tbk tbp tbr tbt te- teb tee tei tek tep ter tet tib tie tii tik tip tir tit tkb tke tkk tkp tkr tkt tpb tpe tpi tpk tpp tpr tpt trb tre tri trk trp trr trt ttb tte tti ttk ttp ttr ttt