b-p bbb bbc bbo bbp bby bcb bcc bco bcp bcy bob boc boo bop boy bpb bpc bpo bpp bpy by- byc byo byp c-- cbb cbc cbo cbp cby ccb ccc cco ccp co- cob coc coo cop coy cpb cpc cpo cpp cyb cyc cyo cyp ob- obb obc obo obp oby oc- ocb occ oco ocp oo- oob ooc ooo oop op- opb opc opo opp opy oyo p-p pbb pbc pbo pbp pby pcb pcc pco pcp pob poc poo pop poy ppb ppc ppo ppp py- pyb pyc pyo ybc ybp yby ycc yco ycp ycy yob yoc yoo yop yoy ypo yyb yyc yyy