-er -up b-p b-u bbb bbe bbi bbl bbp bbq bbr bbu be- beb bee bei bel bep beq ber beu bi- bib bie bii bil bip bir biu blb ble bli bll blp blq blr blu bpb bpe bpi bpl bpp bpr bpu bqe bqp brb bre bri brl brp brq brr bru bub bue bui bul bup bur buu ebb ebe ebi ebl ebp ebq ebr ebu eeb eee eel eep eer eib eie eii eil eip eir eiu elb ele eli ell elp elr elu ep- epb epe epi epl epp epq epr epu eqe eqp eqq equ erb ere eri erl erp erq err eru eu- eub eue eui eul eup eur ibb ibe ibi ibl ibp ibr ibu ie- iee iei iel iep ier iib iie iii iil iip iir iiu il- ilb ile ili ill ilp ilq ilr ilu ipb ipe ipi ipl ipp ipr ipu iqe iqu ir- irb ire iri irl irp irq irr iru iu- iub iue iui iup iur l-p lbb lbe lbi lbl lbp lbr lbu leb lee lei lel lep leq ler leu lib lie lii lil lip liq lir liu llb lle lli lll llp llq llr llu lpb lpe lpi lpl lpp lpr lpu lqr lrb lri lrp lrr lru lub lue lui lul lup lur luu p-p pbb pbe pbi pbl pbp pbr pbu peb pee pei pel pep per peu pib pie pii pil pip piq pir piu plb ple pli pll plp plr plu ppb ppe ppi ppl ppp ppq ppr ppu pqi pqq pqr prb pre pri prl prp prq prr pru pub pue pui pul pup pur puu qbe qbq qee qep qie qil qip qir qiu qlp qpl qpp qpr qqq qqu qrb qre qri qrl qrp qru qu- que qui qul qur rbb rbe rbi rbl rbp rbr rbu re- reb ree rei rel rep req rer reu rib rie rii ril rip riq rir rle rli rll rlp rlr rlu rpb rpe rpi rpl rpp rpr rpu rrb rri rrl rrp rrq rrr rru rub rue rui rup rur ruu ubb ube ubi ubl ubp ubr ubu ueb uee uei uel uep uer uib uie uii uil uip uiq uir uiu ulb ule uli ull ulp ulr ulu up- upb upe upi upp upr upu ur- urb ure uri url urp urr uru uue uur uuu