b-p bbb bbc bbe bbn bbo bbp bbs bcb bcc bce bcn bco bcp bcs be- beb bec bee ben beo bep bes bnb bnc bne bnn bno bnp bns bob boc boe bon boo bop bos bpb bpc bpe bpn bpo bpp bps bsb bsc bse bsn bso bsp bss c-- cbb cbc cbe cbn cbo cbp cbs ccb ccc cce ccn cco ccp ccs ce- ceb cec cee cen ceo cep ces cn- cnb cnc cne cnn cno cnp cns co- cob coc coe con coo cop cos cpb cpc cpe cpn cpo cpp cps csb csc cse csn cso csp css ebb ebc ebe ebn ebo ebp ebs ec- ecb ecc ece ecn eco ecs eeb eec eee een eeo eep ees en- enb enc ene enn eno enp ens eo- eob eoc eoe eon eoo eop eos ep- epb epc epe epn epo epp eps es- esb esc ese esn eso esp ess nbb nbc nbe nbn nbo nbp nbs ncb ncc nce ncn nco ncp ncs ne- neb nec nee nen neo nep nes nnb nnc nne nnn nno nnp nns no- nob noc noe non noo nop nos npb npc npe npn npo npp nps nsb nsc nse nsn nso nsp nss ob- obb obc obe obn obo obp obs oc- ocb occ ocn oco ocp ocs oeb oec oee oen oeo oep oes on- onb onc one onn ono onp ons oo- oob ooc oon ooo oop oos op- opb opc ope opn opo opp ops os- osb osc ose osn oso osp oss p-p pbb pbc pbe pbn pbo pbp pbs pcb pcc pce pcn pco pcp pcs peb pec pee pen peo pep pes pn- pnb pnc pne pnn pno pnp pns pob poc poe pon poo pop pos ppb ppc ppe ppn ppo ppp pps ps- psb psc pse psn pso psp pss sbb sbc sbe sbn sbo sbp sbs scb scc sce scn sco scp scs se- seb sec see sen seo sep ses snb snc sne snn sno snp sns sob soc soe son soo sop sos spb spc spe spn spo spp sps ss- ssb ssc sse ssn sso ssp sss