-er -up b-p b-u bbb bbe bbi bbp bbr bbt bbu be- beb bee bei bep ber bet beu bi- bib bie bii bip bir bit biu bpb bpe bpi bpp bpr bpt bpu brb bre bri brp brr brt bru btb bte bti btp btr btt btu bub bue bui bup bur but buu ebb ebe ebi ebp ebr ebt ebu eeb eee eep eer eet eib eie eii eip eir eit eiu ep- epb epe epi epp epr ept epu erb ere eri erp err ert eru etb ete eti etp etr ett etu eu- eub eue eui eup eur eut ibb ibe ibi ibp ibr ibt ibu ie- iee iei iep ier iet iib iie iii iip iir iit iiu ipb ipe ipi ipp ipr ipt ipu ir- irb ire iri irp irr irt iru itb ite iti itp itt itu iu- iub iue iui iup iur iut p-p pbb pbe pbi pbp pbr pbt pbu peb pee pei pep per pet peu pib pie pii pip pir pit piu ppb ppe ppi ppp ppr ppt ppu prb pre pri prp prr prt pru pt- ptb pte pti ptp ptr ptt ptu pub pue pui pup pur put puu rbb rbe rbi rbp rbr rbt rbu re- reb ree rei rep rer ret reu rib rie rii rip rir rit rpb rpe rpi rpp rpr rpt rpu rrb rri rrp rrr rrt rru rtb rte rti rtp rtr rtt rtu rub rue rui rup rur rut ruu tbb tbe tbi tbp tbr tbt tbu te- teb tee tei tep ter tet teu tib tie tii tip tir tit tiu tpb tpe tpi tpp tpr tpt tpu trb tre tri trp trr trt tru ttb tte tti ttp ttr ttt ttu tub tue tui tup tur tut tuu ubb ube ubi ubp ubr ubt ubu ueb uee uei uep uer uet uib uie uii uip uir uit uiu up- upb upe upi upp upr upt upu ur- urb ure uri urp urr urt uru utb ute uti utp utr utt utu uue uur uut uuu