-er -ic bbb bbc bbe bbi bbn bbo bbr bcb bcc bce bci bcn bco bcr be- beb bec bee bei ben beo ber bi- bib bic bie bii bin bio bir bnb bnc bne bni bnn bno bnr bob boc boe boi bon boo bor brb bre bri brn bro brr c-- cbb cbc cbe cbi cbn cbo cbr ccb ccc cce cci ccn cco ccr ce- ceb cec cee cei cen ceo cer ci- cib cic cie cii cin cio cir cn- cnb cnc cne cni cnn cno cnr co- cob coc coe coi con coo cor crb crc cre cri crn cro crr ebb ebc ebe ebi ebn ebo ebr ec- ecb ecc ece eci ecn eco ecr eeb eec eee een eeo eer eib eic eie eii ein eio eir en- enb enc ene eni enn eno enr eo- eob eoc eoe eoi eon eoo eor erb erc ere eri ern ero err ibb ibc ibe ibi ibn ibo ibr icb icc ice ici icn ico icr ie- iec iee iei ien ier iib iic iie iii iin iio iir in- inb inc ine ini inn ino inr io- iob ioc ioe ioi ion ioo ior ir- irb irc ire iri irn iro irr n-i nbb nbc nbe nbi nbn nbo nbr ncb ncc nce nci ncn nco ncr ne- neb nec nee nei nen neo ner nib nic nie nii nin nio nir nnb nnc nne nni nnn nno no- nob noc noe noi non noo nor nrb nrc nre nri nrn nro nrr o-i ob- obb obc obe obi obn obo obr oc- ocb occ oci ocn oco ocr oeb oec oee oei oen oeo oer oib oic oie oii oin oio oir on- onb onc one oni onn ono onr oo- oob ooc ooi oon ooo oor or- orb orc ore ori orn oro orr rbb rbc rbe rbi rbn rbo rbr rcb rcc rce rci rcn rco rcr re- reb rec ree rei ren reo rer rib ric rie rii rin rio rir rnb rnc rni rnn rno rnr rob roc roe roi ron roo ror rrb rrc rri rrn rrr