-er -up b-p b-u bbb bbe bbk bbp bbr bbs bbu be- beb bee bek bep ber bes beu bkb bke bkk bkp bkr bks bpb bpe bpp bpr bps bpu brb bre brk brp brr brs bru bsb bse bsk bsp bsr bss bsu bub bue buk bup bur bus buu ebb ebe ebk ebp ebr ebs ebu eeb eee eek eep eer ees ekb eke ekp ekr eks eku ep- epb epe epp epr eps epu erb ere erk erp err ers eru es- esb ese esk esp esr ess esu eu- eub eue eup eur eus kbb kbe kbk kbp kbr kbs kbu ke- keb kee kek kep ker kes kkb kke kkk kkp kkr kks kku kpe kpk kpp kpr kps kpu krk krp krr krs kru ksb kse ksk ksp ksr kss ksu kub kue kuk kup kur kus kuu p-p pbb pbe pbk pbp pbr pbs pbu peb pee pek pep per pes peu pkb pke pkp pkr pks pku ppb ppe ppk ppp ppr pps ppu prb pre prk prp prr prs pru ps- psb pse psk psp psr pss psu pub pue puk pup pur pus puu rbb rbe rbk rbp rbr rbs rbu re- reb ree rek rep rer res reu rkb rke rkk rkp rks rku rpb rpe rpk rpp rpr rps rpu rrb rrk rrp rrr rrs rru rsb rse rsk rsp rsr rss rsu rub rue ruk rup rur rus ruu sbb sbe sbk sbp sbr sbs sbu se- seb see sek sep ser ses seu sk- skb ske skk skp skr sks sku spb spe spk spp spr sps spu sr- srb sre srk srp srr srs ss- ssb sse ssk ssp ssr sss ssu sub sue suk sup sur sus suu ubb ube ubk ubp ubr ubs ubu ueb uee uep uer ues ukb uke ukk ukp ukr uku up- upb upe upk upp upr ups upu ur- urb ure urk urp urr urs uru usb use usk usp usr uss usu uue uur uus uuu