-er -ic bbb bbc bbe bbg bbi bbn bbo bbr bcb bcc bce bcg bci bcn bco bcr be- beb bec bee beg bei ben beo ber bgb bgc bge bgg bgi bgn bgo bgr bi- bib bic bie big bii bin bio bir bnb bnc bne bng bni bnn bno bnr bob boc boe bog boi bon boo bor brb bre brg bri brn bro brr c-- cbb cbc cbe cbg cbi cbn cbo cbr ccb ccc cce ccg cci ccn cco ccr ce- ceb cec cee ceg cei cen ceo cer cgb cgc cge cgg cgi cgn cgo cgr ci- cib cic cie cig cii cin cio cir cn- cnb cnc cne cng cni cnn cno cnr co- cob coc coe cog coi con coo cor crb crc cre crg cri crn cro crr ebb ebc ebe ebg ebi ebn ebo ebr ec- ecb ecc ece ecg eci ecn eco ecr eeb eec eee eeg een eeo eer egb egc ege egg egi egn ego egr eib eic eie eig eii ein eio eir en- enb enc ene eng eni enn eno enr eo- eob eoc eoe eog eoi eon eoo eor erb erc ere erg eri ern ero err gbc gbe gbg gbi gbn gbo gbr gcb gcc gce gcg gci gcn gco gcr ge- geb gec gee geg gei gen geo ger ggb ggc ggg ggi ggn ggo ggr gib gic gie gig gii gin gio gir gnb gnc gne gni gnn gno gnr gob goc goe gog goi gon goo gor grb grc gre grg gri grn gro grr ibb ibc ibe ibg ibi ibn ibo ibr icb icc ice icg ici icn ico icr ie- iec iee ieg iei ien ier igb igc ige igg igi ign igo igr iib iic iie iii iin iio iir in- inb inc ine ing ini inn ino inr io- iob ioc ioe iog ioi ion ioo ior ir- irb irc ire irg iri irn iro irr n-i nbb nbc nbe nbg nbi nbn nbo nbr ncb ncc nce ncg nci ncn nco ncr ne- neb nec nee neg nei nen neo ner ngb ngc nge ngg ngi ngn ngo nib nic nie nig nii nin nio nir nnb nnc nne nng nni nnn nno no- nob noc noe nog noi non noo nor nrb nrc nre nrg nri nrn nro nrr o-i ob- obb obc obe obg obi obn obo obr oc- ocb occ ocg oci ocn oco ocr oeb oec oee oeg oei oen oeo oer ogc oge ogg ogi ogn ogo oib oic oie oii oin oio oir on- onb onc one ong oni onn ono onr oo- oob ooc oog ooi oon ooo oor or- orb orc ore org ori orn oro orr rbb rbc rbe rbg rbi rbn rbo rbr rcb rcc rce rcg rci rcn rco rcr re- reb rec ree reg rei ren reo rer rgb rgc rge rgg rgi rgn rgo rgr rib ric rie rig rii rin rio rir rnb rnc rng rni rnn rno rnr rob roc roe rog roi ron roo ror rrb rrc rrg rri rrn rrr