b-p bbb bbc bbo bbp bbt bby bcb bcc bco bcp bct bcy bob boc boo bop bot boy bpb bpc bpo bpp bpt bpy btb btc bto btp btt bty by- byc byo byp byt c-- cbb cbc cbo cbp cbt cby ccb ccc cco ccp cct co- cob coc coo cop cot coy cpb cpc cpo cpp cpt ctb ctc cto ctp ctt cty cyb cyc cyo cyp cyt ob- obb obc obo obp obt oby oc- ocb occ oco ocp oct oo- oob ooc ooo oop oot op- opb opc opo opp opt opy ot- otb otc oto otp ott oyo p-p pbb pbc pbo pbp pbt pby pcb pcc pco pcp pct pob poc poo pop pot poy ppb ppc ppo ppp ppt pt- ptb ptc pto ptp ptt pty py- pyb pyc pyo pyt tbb tbc tbo tbp tbt tcb tcc tco tcp tct to- tob toc too top tot toy tpb tpc tpo tpp tpt ttb ttc tto ttp ttt tty tyc tyo typ tyt ybc ybp yby ycc yco ycp ycy yob yoc yoo yop yot yoy ypo ytc yto ytp ytt yyb yyc yyt yyy