b-p bbb bbc bbe bbn bbo bbp bbt bcb bcc bce bcn bco bcp bct be- beb bec bee ben beo bep bet bnb bnc bne bnn bno bnp bnt bob boc boe bon boo bop bot bpb bpc bpe bpn bpo bpp bpt btb btc bte btn bto btp btt c-- cbb cbc cbe cbn cbo cbp cbt ccb ccc cce ccn cco ccp cct ce- ceb cec cee cen ceo cep cet cn- cnb cnc cne cnn cno cnp cnt co- cob coc coe con coo cop cot cpb cpc cpe cpn cpo cpp cpt ctb ctc cte ctn cto ctp ctt ebb ebc ebe ebn ebo ebp ebt ec- ecb ecc ece ecn eco ect eeb eec eee een eeo eep eet en- enb enc ene enn eno enp ent eo- eob eoc eoe eon eoo eop eot ep- epb epc epe epn epo epp ept etb etc ete etn eto etp ett nbb nbc nbe nbn nbo nbp nbt ncb ncc nce ncn nco ncp nct ne- neb nec nee nen neo nep net nnb nnc nne nnn nno nnp nnt no- nob noc noe non noo nop not npb npc npe npn npo npp npt ntb ntc nte ntn nto ntp ntt ob- obb obc obe obn obo obp obt oc- ocb occ ocn oco ocp oct oeb oec oee oen oeo oep oet on- onb onc one onn ono onp ont oo- oob ooc oon ooo oop oot op- opb opc ope opn opo opp opt ot- otb otc ote otn oto otp ott p-p pbb pbc pbe pbn pbo pbp pbt pcb pcc pce pcn pco pcp pct peb pec pee pen peo pep pet pn- pnb pnc pne pnn pno pnp pnt pob poc poe pon poo pop pot ppb ppc ppe ppn ppo ppp ppt pt- ptb ptc pte ptn pto ptp ptt tbb tbc tbe tbn tbo tbp tbt tcb tcc tce tcn tco tcp tct te- teb tec tee ten teo tep tet tnb tnc tne tnn tno tnp tnt to- tob toc toe ton too top tot tpb tpc tpe tpn tpo tpp tpt ttb ttc tte ttn tto ttp ttt