-er -ic b-p bbb bbc bbe bbi bbo bbp bbr bcb bcc bce bci bco bcp bcr be- beb bec bee bei beo bep ber bi- bib bic bie bii bio bip bir bob boc boe boi boo bop bor bpb bpc bpe bpi bpo bpp bpr brb bre bri bro brp brr c-- cbb cbc cbe cbi cbo cbp cbr ccb ccc cce cci cco ccp ccr ce- ceb cec cee cei ceo cep cer ci- cib cic cie cii cio cip cir co- cob coc coe coi coo cop cor cpb cpc cpe cpi cpo cpp cpr crb crc cre cri cro crp crr ebb ebc ebe ebi ebo ebp ebr ec- ecb ecc ece eci eco ecr eeb eec eee eeo eep eer eib eic eie eii eio eip eir eo- eob eoc eoe eoi eoo eop eor ep- epb epc epe epi epo epp epr erb erc ere eri ero erp err ibb ibc ibe ibi ibo ibp ibr icb icc ice ici ico icp icr ie- iec iee iei iep ier iib iic iie iii iio iip iir io- iob ioc ioe ioi ioo iop ior ipb ipc ipe ipi ipo ipp ipr ir- irb irc ire iri iro irp irr o-i ob- obb obc obe obi obo obp obr oc- ocb occ oci oco ocp ocr oeb oec oee oei oeo oep oer oib oic oie oii oio oip oir oo- oob ooc ooi ooo oop oor op- opb opc ope opi opo opp opr or- orb orc ore ori oro orp orr p-p pbb pbc pbe pbi pbo pbp pbr pcb pcc pce pci pco pcp pcr peb pec pee pei peo pep per pib pic pie pii pio pip pir pob poc poe poi poo pop por ppb ppc ppe ppi ppo ppp ppr prb prc pre pri pro prp prr rbb rbc rbe rbi rbo rbp rbr rcb rcc rce rci rco rcp rcr re- reb rec ree rei reo rep rer rib ric rie rii rio rip rir rob roc roe roi roo rop ror rpb rpc rpe rpi rpo rpp rpr rrb rrc rri rrp rrr