-ic b-p bbb bbc bbi bbo bbp bcb bcc bci bco bcp bi- bib bic bii bio bip bob boc boi boo bop bpb bpc bpi bpo bpp c-- cbb cbc cbi cbo cbp ccb ccc cci cco ccp ci- cib cic cii cio cip co- cob coc coi coo cop cpb cpc cpi cpo cpp ibb ibc ibi ibo ibp icb icc ici ico icp iib iic iii iio iip io- iob ioc ioi ioo iop ipb ipc ipi ipo ipp o-i ob- obb obc obi obo obp oc- ocb occ oci oco ocp oib oic oii oio oip oo- oob ooc ooi ooo oop op- opb opc opi opo opp p-p pbb pbc pbi pbo pbp pcb pcc pci pco pcp pib pic pii pio pip pob poc poi poo pop ppb ppc ppi ppo ppp