-ic bbb bbc bbe bbi bbo bbt bcb bcc bce bci bco bct bcv be- beb bec bee bei beo bet bev bi- bib bic bie bii bio bit biv bob boc boe boi boo bot bov btb btc bte bti bto btt btv bvb bvc bve bvi bvo bvt bvv c-- cbb cbc cbe cbi cbo cbt cbv ccb ccc cce cci cco cct ccv ce- ceb cec cee cei ceo cet cev ci- cib cic cie cii cio cit civ co- cob coc coe coi coo cot cov ctb ctc cte cti cto ctt ctv cvb cvc cve cvi cvo cvt cvv ebb ebc ebe ebi ebo ebt ebv ec- ecb ecc ece eci eco ect ecv eeb eec eee eeo eet eev eib eic eie eii eio eit eiv eo- eob eoc eoe eoi eoo eot etb etc ete eti eto ett etv evb evc eve evi evo evt evv i-v ibb ibc ibe ibi ibo ibt ibv icb icc ice ici ico ict icv ie- iec iee iei iet iev iib iic iie iii iio iit io- iob ioc ioe ioi ioo iot iov itb itc ite iti ito itt itv ivb ivc ive ivi ivo ivt ivv o-i ob- obb obc obe obi obo obt obv oc- ocb occ oci oco oct ocv oeb oec oee oei oeo oet oib oic oie oii oio oit oiv oo- oob ooc ooi ooo oot oov ot- otb otc ote oti oto ott otv ov- ovb ovc ove ovi ovo ovv tbb tbc tbe tbi tbo tbt tbv tcb tcc tce tci tco tct tcv te- teb tec tee tei teo tet tev tib tic tie tii tio tit tiv to- tob toc toe toi too tot tov ttb ttc tte tti tto ttt ttv tvb tvc tve tvi tvo tvt v-e vbc vbi vbo vbv vcc vce vci vco vct veb vec vee vei veo vet vi- vib vic vie vii vio vit viv vob voc voe voi voo vot vov vtb vtc vte vti vto vtt vtv vvb vvc vvi vvo vvt vvv