-ic b-p bbb bbc bbe bbi bbo bbp bbt bcb bcc bce bci bco bcp bct be- beb bec bee bei beo bep bet bi- bib bic bie bii bio bip bit bob boc boe boi boo bop bot bpb bpc bpe bpi bpo bpp bpt btb btc bte bti bto btp btt c-- cbb cbc cbe cbi cbo cbp cbt ccb ccc cce cci cco ccp cct ce- ceb cec cee cei ceo cep cet ci- cib cic cie cii cio cip cit co- cob coc coe coi coo cop cot cpb cpc cpe cpi cpo cpp cpt ctb ctc cte cti cto ctp ctt ebb ebc ebe ebi ebo ebp ebt ec- ecb ecc ece eci eco ect eeb eec eee eeo eep eet eib eic eie eii eio eip eit eo- eob eoc eoe eoi eoo eop eot ep- epb epc epe epi epo epp ept etb etc ete eti eto etp ett ibb ibc ibe ibi ibo ibp ibt icb icc ice ici ico icp ict ie- iec iee iei iep iet iib iic iie iii iio iip iit io- iob ioc ioe ioi ioo iop iot ipb ipc ipe ipi ipo ipp ipt itb itc ite iti ito itp itt o-i ob- obb obc obe obi obo obp obt oc- ocb occ oci oco ocp oct oeb oec oee oei oeo oep oet oib oic oie oii oio oip oit oo- oob ooc ooi ooo oop oot op- opb opc ope opi opo opp opt ot- otb otc ote oti oto otp ott p-p pbb pbc pbe pbi pbo pbp pbt pcb pcc pce pci pco pcp pct peb pec pee pei peo pep pet pib pic pie pii pio pip pit pob poc poe poi poo pop pot ppb ppc ppe ppi ppo ppp ppt pt- ptb ptc pte pti pto ptp ptt tbb tbc tbe tbi tbo tbp tbt tcb tcc tce tci tco tcp tct te- teb tec tee tei teo tep tet tib tic tie tii tio tip tit to- tob toc toe toi too top tot tpb tpc tpe tpi tpo tpp tpt ttb ttc tte tti tto ttp ttt