-ic b-u bbb bbc bbi bbn bbo bbr bbu bcb bcc bci bcn bco bcr bcu bi- bib bic bii bin bio bir biu bnb bnc bni bnn bno bnr bnu bob boc boi bon boo bor bou brb bri brn bro brr bru bub buc bui bun buo bur buu c-- cbb cbc cbi cbn cbo cbr cbu ccb ccc cci ccn cco ccr ccu ci- cib cic cii cin cio cir ciu cn- cnb cnc cni cnn cno cnr cnu co- cob coc coi con coo cor cou crb crc cri crn cro crr cru cub cuc cui cun cuo cur cuu ibb ibc ibi ibn ibo ibr ibu icb icc ici icn ico icr icu iib iic iii iin iio iir iiu in- inb inc ini inn ino inr inu io- iob ioc ioi ion ioo ior iou ir- irb irc iri irn iro irr iru iu- iub iuc iui iur n-i nbb nbc nbi nbn nbo nbr nbu ncb ncc nci ncn nco ncr ncu nib nic nii nin nio nir niu nnb nnc nni nnn nno nnu no- nob noc noi non noo nor nou nrb nrc nri nrn nro nrr nru nub nuc nui nun nuo nur nuu o-i ob- obb obc obi obn obo obr obu oc- ocb occ oci ocn oco ocr ocu oib oic oii oin oio oir oiu on- onb onc oni onn ono onr onu oo- oob ooc ooi oon ooo oor or- orb orc ori orn oro orr oru ou- ouc oui oun ouo our rbb rbc rbi rbn rbo rbr rbu rcb rcc rci rcn rco rcr rcu rib ric rii rin rio rir rnb rnc rni rnn rno rnr rnu rob roc roi ron roo ror rou rrb rrc rri rrn rrr rru rub ruc rui run ruo rur ruu ubb ubc ubi ubn ubo ubr ubu ucb ucc uci ucn uco ucr ucu uib uic uii uin uio uir uiu un- unb unc uni unn uno unr unu uob uoc uon uoo uor ur- urb urc uri urn uro urr uru uuc uun uur uuu