-ic b-p bbb bbc bbi bbp bbr bbs bcb bcc bci bcp bcr bcs bi- bib bic bii bip bir bis bpb bpc bpi bpp bpr bps brb bri brp brr brs bsb bsc bsi bsp bsr bss c-- cbb cbc cbi cbp cbr cbs ccb ccc cci ccp ccr ccs ci- cib cic cii cip cir cis cpb cpc cpi cpp cpr cps crb crc cri crp crr crs csb csc csi csp csr css ibb ibc ibi ibp ibr ibs icb icc ici icp icr ics iib iic iii iip iir iis ipb ipc ipi ipp ipr ips ir- irb irc iri irp irr irs is- isb isc isi isp isr iss p-p pbb pbc pbi pbp pbr pbs pcb pcc pci pcp pcr pcs pib pic pii pip pir pis ppb ppc ppi ppp ppr pps prb prc pri prp prr prs ps- psb psc psi psp psr pss rbb rbc rbi rbp rbr rbs rcb rcc rci rcp rcr rcs rib ric rii rip rir ris rpb rpc rpi rpp rpr rps rrb rrc rri rrp rrr rrs rsb rsc rsi rsp rsr rss sbb sbc sbi sbp sbr sbs scb scc sci scp scr scs sib sic sii sip sir sis spb spc spi spp spr sps sr- srb src sri srp srr srs ss- ssb ssc ssi ssp ssr sss