-ic bbb bbc bbe bbi bbk bbn bbo bcb bcc bce bci bck bcn bco bcv be- beb bec bee bei bek ben beo bev bi- bib bic bie bii bik bin bio biv bkb bkc bke bkk bkn bko bkv bnb bnc bne bni bnk bnn bno bnv bob boc boe boi bok bon boo bov bvb bvc bve bvi bvk bvn bvo bvv c-- cbb cbc cbe cbi cbk cbn cbo cbv ccb ccc cce cci cck ccn cco ccv ce- ceb cec cee cei cek cen ceo cev ci- cib cic cie cii cik cin cio civ ckb ckc cki cko cn- cnb cnc cne cni cnn cno cnv co- cob coc coe coi cok con coo cov cvb cvc cve cvi cvk cvn cvo cvv ebb ebc ebe ebi ebk ebn ebo ebv ec- ecb ecc ece eci eck ecn eco ecv eeb eec eee eek een eeo eev eib eic eie eii eik ein eio eiv ekb ekc eke eki eko ekv en- enb enc ene eni enk enn eno env eo- eob eoc eoe eoi eok eon eoo evb evc eve evi evn evo evv i-v ibb ibc ibe ibi ibk ibn ibo ibv icb icc ice ici ick icn ico icv ie- iec iee iei iek ien iev iib iic iie iii iin iio ikb ikc ike iki ikk iko ikv in- inb inc ine ini ink inn ino inv io- iob ioc ioe ioi ion ioo iov ivb ivc ive ivi ivo ivv kbb kbc kbe kbi kbk kbn kbo kcb kcc kce kci kck kcn ke- keb kec kee kei kek ken keo kev kib kic kie kii kik kin kio kiv kkb kkc kke kki kkk kkn kkv kn- knc kne kni knk knn kno kob koc koe koi kok kon koo kvb kvi kvk kvn kvo kvv n-i nbb nbc nbe nbi nbk nbn nbo nbv ncb ncc nce nci nck ncn nco ncv ne- neb nec nee nei nek nen neo nev nib nic nie nii nik nin nio niv nkc nke nki nkk nkn nko nnb nnc nne nni nnk nnn nno nnv no- nob noc noe noi nok non noo nov nvb nvc nve nvi nvk nvn nvv o-i ob- obb obc obe obi obk obn obo obv oc- ocb occ oci ock ocn oco ocv oeb oec oee oei oen oeo oib oic oie oii oik oin oio oiv okb okc oke oki okk oko on- onb onc one oni onk onn ono oo- oob ooc ooi ook oon ooo oov ov- ovb ovc ove ovi ovo ovv v-e vbc vbi vbk vbo vbv vcc vce vci vcn vco veb vec vee vei vek ven veo vi- vib vic vie vii vik vin vio viv vkb vn- vni vno vnv vob voc voe voi vok von voo vov vvb vvc vvi vvo vvv