-ic b-u bbb bbc bbi bbk bbn bbo bbr bbu bcb bcc bci bck bcn bco bcr bcu bi- bib bic bii bik bin bio bir biu bkb bkc bkk bkn bko bkr bnb bnc bni bnk bnn bno bnr bnu bob boc boi bok bon boo bor bou brb bri brk brn bro brr bru bub buc bui buk bun buo bur buu c-- cbb cbc cbi cbk cbn cbo cbr cbu ccb ccc cci cck ccn cco ccr ccu ci- cib cic cii cik cin cio cir ciu ckb ckc cki cko cn- cnb cnc cni cnn cno cnr cnu co- cob coc coi cok con coo cor cou crb crc cri crk crn cro crr cru cub cuc cui cuk cun cuo cur cuu ibb ibc ibi ibk ibn ibo ibr ibu icb icc ici ick icn ico icr icu iib iic iii iin iio iir iiu ikb ikc iki ikk iko ikr iku in- inb inc ini ink inn ino inr inu io- iob ioc ioi ion ioo ior iou ir- irb irc iri irk irn iro irr iru iu- iub iuc iui iur kbb kbc kbi kbk kbn kbo kbr kbu kcb kcc kci kck kcn kcr kcu kib kic kii kik kin kio kir kiu kkb kkc kki kkk kkn kkr kku kn- knc kni knk knn kno knr knu kob koc koi kok kon koo kor kou krc kri krk krn kro krr kru kub kuc kui kuk kun kur kuu n-i nbb nbc nbi nbk nbn nbo nbr nbu ncb ncc nci nck ncn nco ncr ncu nib nic nii nik nin nio nir niu nkc nki nkk nkn nko nkr nku nnb nnc nni nnk nnn nno nnu no- nob noc noi nok non noo nor nou nrb nrc nri nrk nrn nro nrr nru nub nuc nui nuk nun nuo nur nuu o-i ob- obb obc obi obk obn obo obr obu oc- ocb occ oci ock ocn oco ocr ocu oib oic oii oik oin oio oir oiu okb okc oki okk oko okr oku on- onb onc oni onk onn ono onr onu oo- oob ooc ooi ook oon ooo oor or- orb orc ori ork orn oro orr oru ou- ouc oui ouk oun ouo our rbb rbc rbi rbk rbn rbo rbr rbu rcb rcc rci rcn rco rcr rcu rib ric rii rik rin rio rir rkb rkc rkk rko rku rnb rnc rni rnn rno rnr rnu rob roc roi rok ron roo ror rou rrb rrc rri rrk rrn rrr rru rub ruc rui ruk run ruo rur ruu ubb ubc ubi ubk ubn ubo ubr ubu ucb ucc uci uck ucn uco ucr ucu uib uic uii uin uio uir uiu ukb ukc uki ukk ukn ukr uku un- unb unc uni unk unn uno unr unu uob uoc uok uon uoo uor ur- urb urc uri urk urn uro urr uru uuc uun uur uuu