-ic bbb bbc bbe bbg bbi bbk bbn bbo bcb bcc bce bcg bci bck bcn bco be- beb bec bee beg bei bek ben beo bgb bgc bge bgg bgi bgk bgn bgo bi- bib bic bie big bii bik bin bio bkb bkc bke bkg bkk bkn bko bnb bnc bne bng bni bnk bnn bno bob boc boe bog boi bok bon boo c-- cbb cbc cbe cbg cbi cbk cbn cbo ccb ccc cce ccg cci cck ccn cco ce- ceb cec cee ceg cei cek cen ceo cgb cgc cge cgg cgi cgn cgo ci- cib cic cie cig cii cik cin cio ckb ckc cki cko cn- cnb cnc cne cng cni cnn cno co- cob coc coe cog coi cok con coo ebb ebc ebe ebg ebi ebk ebn ebo ec- ecb ecc ece ecg eci eck ecn eco eeb eec eee eeg eek een eeo egb egc ege egg egi egn ego eib eic eie eig eii eik ein eio ekb ekc eke ekg eki eko en- enb enc ene eng eni enk enn eno eo- eob eoc eoe eog eoi eok eon eoo gbc gbe gbg gbi gbk gbn gbo gcb gcc gce gcg gci gck gcn gco ge- geb gec gee geg gei gek gen geo ggb ggc ggg ggi ggn ggo gib gic gie gig gii gik gin gio gkb gkn gko gnb gnc gne gni gnn gno gob goc goe gog goi gok gon goo ibb ibc ibe ibg ibi ibk ibn ibo icb icc ice icg ici ick icn ico ie- iec iee ieg iei iek ien igb igc ige igg igi igk ign igo iib iic iie iii iin iio ikb ikc ike iki ikk iko in- inb inc ine ing ini ink inn ino io- iob ioc ioe iog ioi ion ioo kbb kbc kbe kbi kbk kbn kbo kcb kcc kce kcg kci kck kcn ke- keb kec kee keg kei kek ken keo kgb kgc kgi kgo kib kic kie kig kii kik kin kio kkb kkc kke kki kkk kkn kn- knc kne kng kni knk knn kno kob koc koe kog koi kok kon koo n-i nbb nbc nbe nbg nbi nbk nbn nbo ncb ncc nce ncg nci nck ncn nco ne- neb nec nee neg nei nek nen neo ngb ngc nge ngg ngi ngk ngn ngo nib nic nie nig nii nik nin nio nkc nke nki nkk nkn nko nnb nnc nne nng nni nnk nnn nno no- nob noc noe nog noi nok non noo o-i ob- obb obc obe obg obi obk obn obo oc- ocb occ ocg oci ock ocn oco oeb oec oee oeg oei oen oeo ogc oge ogg ogi ogn ogo oib oic oie oii oik oin oio okb okc oke okg oki okk oko on- onb onc one ong oni onk onn ono oo- oob ooc oog ooi ook oon ooo