-ic b-p bbb bbc bbe bbf bbi bbp bbs bcb bcc bce bcf bci bcp bcs be- beb bec bee bef bei bep bes bfb bfc bfe bff bfi bfp bfs bi- bib bic bie bif bii bip bis bpb bpc bpe bpf bpi bpp bps bsb bsc bse bsf bsi bsp bss c-- cbb cbc cbe cbf cbi cbp cbs ccb ccc cce ccf cci ccp ccs ce- ceb cec cee cef cei cep ces cfb cfc cfe cff cfi cfp cfs ci- cib cic cie cif cii cip cis cpb cpc cpe cpf cpi cpp cps csb csc cse csf csi csp css ebb ebc ebe ebf ebi ebp ebs ec- ecb ecc ece ecf eci ecs eeb eec eee eef eep ees ef- efb efc efe eff efi efp efs eib eic eie eif eii eip eis ep- epb epc epe epf epi epp eps es- esb esc ese esf esi esp ess fbb fbc fbe fbf fbi fbp fbs fcb fcc fce fcf fci fcp fcs feb fec fee fef fei fep fes ffc ffe fff ffi ffp ffs fib fic fie fif fii fip fis fpb fpc fpe fpi fpp fps fsb fsc fse fsf fsi fsp fss i-f ibb ibc ibe ibf ibi ibp ibs icb icc ice icf ici icp ics ie- iec iee ief iei iep ies ifb ifc ife iff ifi ifp ifs iib iic iie iif iii iip iis ipb ipc ipe ipf ipi ipp ips is- isb isc ise isf isi isp iss p-p pbb pbc pbe pbf pbi pbp pbs pcb pcc pce pcf pci pcp pcs peb pec pee pef pei pep pes pfb pfc pfe pff pfi pfp pfs pib pic pie pif pii pip pis ppb ppc ppe ppf ppi ppp pps ps- psb psc pse psf psi psp pss sbb sbc sbe sbf sbi sbp sbs scb scc sce scf sci scp scs se- seb sec see sef sei sep ses sfb sfc sfe sff sfi sfp sfs sib sic sie sif sii sip sis spb spc spe spf spi spp sps ss- ssb ssc sse ssf ssi ssp sss