-ic b-p bbb bbc bbe bbi bbp bbs bcb bcc bce bci bcp bcs be- beb bec bee bei bep bes bi- bib bic bie bii bip bis bpb bpc bpe bpi bpp bps bsb bsc bse bsi bsp bss c-- cbb cbc cbe cbi cbp cbs ccb ccc cce cci ccp ccs ce- ceb cec cee cei cep ces ci- cib cic cie cii cip cis cpb cpc cpe cpi cpp cps csb csc cse csi csp css ebb ebc ebe ebi ebp ebs ec- ecb ecc ece eci ecs eeb eec eee eep ees eib eic eie eii eip eis ep- epb epc epe epi epp eps es- esb esc ese esi esp ess ibb ibc ibe ibi ibp ibs icb icc ice ici icp ics ie- iec iee iei iep ies iib iic iie iii iip iis ipb ipc ipe ipi ipp ips is- isb isc ise isi isp iss p-p pbb pbc pbe pbi pbp pbs pcb pcc pce pci pcp pcs peb pec pee pei pep pes pib pic pie pii pip pis ppb ppc ppe ppi ppp pps ps- psb psc pse psi psp pss sbb sbc sbe sbi sbp sbs scb scc sce sci scp scs se- seb sec see sei sep ses sib sic sie sii sip sis spb spc spe spi spp sps ss- ssb ssc sse ssi ssp sss