-ic b-p bbb bbc bbe bbi bbo bbp bbs bcb bcc bce bci bco bcp bcs be- beb bec bee bei beo bep bes bi- bib bic bie bii bio bip bis bob boc boe boi boo bop bos bpb bpc bpe bpi bpo bpp bps bsb bsc bse bsi bso bsp bss c-- cbb cbc cbe cbi cbo cbp cbs ccb ccc cce cci cco ccp ccs ce- ceb cec cee cei ceo cep ces ci- cib cic cie cii cio cip cis co- cob coc coe coi coo cop cos cpb cpc cpe cpi cpo cpp cps csb csc cse csi cso csp css ebb ebc ebe ebi ebo ebp ebs ec- ecb ecc ece eci eco ecs eeb eec eee eeo eep ees eib eic eie eii eio eip eis eo- eob eoc eoe eoi eoo eop eos ep- epb epc epe epi epo epp eps es- esb esc ese esi eso esp ess ibb ibc ibe ibi ibo ibp ibs icb icc ice ici ico icp ics ie- iec iee iei iep ies iib iic iie iii iio iip iis io- iob ioc ioe ioi ioo iop ios ipb ipc ipe ipi ipo ipp ips is- isb isc ise isi iso isp iss o-i ob- obb obc obe obi obo obp obs oc- ocb occ oci oco ocp ocs oeb oec oee oei oeo oep oes oib oic oie oii oio oip ois oo- oob ooc ooi ooo oop oos op- opb opc ope opi opo opp ops os- osb osc ose osi oso osp oss p-p pbb pbc pbe pbi pbo pbp pbs pcb pcc pce pci pco pcp pcs peb pec pee pei peo pep pes pib pic pie pii pio pip pis pob poc poe poi poo pop pos ppb ppc ppe ppi ppo ppp pps ps- psb psc pse psi pso psp pss sbb sbc sbe sbi sbo sbp sbs scb scc sce sci sco scp scs se- seb sec see sei seo sep ses sib sic sie sii sio sip sis sob soc soe soi soo sop sos spb spc spe spi spo spp sps ss- ssb ssc sse ssi sso ssp sss