-er -ic b-p bbb bbc bbe bbi bbo bbp bbr bbt bcb bcc bce bci bco bcp bcr bct be- beb bec bee bei beo bep ber bet bi- bib bic bie bii bio bip bir bit bob boc boe boi boo bop bor bot bpb bpc bpe bpi bpo bpp bpr bpt brb bre bri bro brp brr brt btb btc bte bti bto btp btr btt c-- cbb cbc cbe cbi cbo cbp cbr cbt ccb ccc cce cci cco ccp ccr cct ce- ceb cec cee cei ceo cep cer cet ci- cib cic cie cii cio cip cir cit co- cob coc coe coi coo cop cor cot cpb cpc cpe cpi cpo cpp cpr cpt crb crc cre cri cro crp crr crt ctb ctc cte cti cto ctp ctr ctt ebb ebc ebe ebi ebo ebp ebr ebt ec- ecb ecc ece eci eco ecr ect eeb eec eee eeo eep eer eet eib eic eie eii eio eip eir eit eo- eob eoc eoe eoi eoo eop eor eot ep- epb epc epe epi epo epp epr ept erb erc ere eri ero erp err ert etb etc ete eti eto etp etr ett ibb ibc ibe ibi ibo ibp ibr ibt icb icc ice ici ico icp icr ict ie- iec iee iei iep ier iet iib iic iie iii iio iip iir iit io- iob ioc ioe ioi ioo iop ior iot ipb ipc ipe ipi ipo ipp ipr ipt ir- irb irc ire iri iro irp irr irt itb itc ite iti ito itp itt o-i ob- obb obc obe obi obo obp obr obt oc- ocb occ oci oco ocp ocr oct oeb oec oee oei oeo oep oer oet oib oic oie oii oio oip oir oit oo- oob ooc ooi ooo oop oor oot op- opb opc ope opi opo opp opr opt or- orb orc ore ori oro orp orr ort ot- otb otc ote oti oto otp otr ott p-p pbb pbc pbe pbi pbo pbp pbr pbt pcb pcc pce pci pco pcp pcr pct peb pec pee pei peo pep per pet pib pic pie pii pio pip pir pit pob poc poe poi poo pop por pot ppb ppc ppe ppi ppo ppp ppr ppt prb prc pre pri pro prp prr prt pt- ptb ptc pte pti pto ptp ptr ptt rbb rbc rbe rbi rbo rbp rbr rbt rcb rcc rce rci rco rcp rcr rct re- reb rec ree rei reo rep rer ret rib ric rie rii rio rip rir rit rob roc roe roi roo rop ror rot rpb rpc rpe rpi rpo rpp rpr rpt rrb rrc rri rrp rrr rrt rtb rtc rte rti rto rtp rtr rtt tbb tbc tbe tbi tbo tbp tbr tbt tcb tcc tce tci tco tcp tcr tct te- teb tec tee tei teo tep ter tet tib tic tie tii tio tip tir tit to- tob toc toe toi too top tor tot tpb tpc tpe tpi tpo tpp tpr tpt trb trc tre tri tro trp trr trt ttb ttc tte tti tto ttp ttr ttt