-er -ic b-p bbb bbc bbe bbi bbn bbo bbp bbr bcb bcc bce bci bcn bco bcp bcr be- beb bec bee bei ben beo bep ber bi- bib bic bie bii bin bio bip bir bnb bnc bne bni bnn bno bnp bnr bob boc boe boi bon boo bop bor bpb bpc bpe bpi bpn bpo bpp bpr brb bre bri brn bro brp brr c-- cbb cbc cbe cbi cbn cbo cbp cbr ccb ccc cce cci ccn cco ccp ccr ce- ceb cec cee cei cen ceo cep cer ci- cib cic cie cii cin cio cip cir cn- cnb cnc cne cni cnn cno cnp cnr co- cob coc coe coi con coo cop cor cpb cpc cpe cpi cpn cpo cpp cpr crb crc cre cri crn cro crp crr ebb ebc ebe ebi ebn ebo ebp ebr ec- ecb ecc ece eci ecn eco ecr eeb eec eee een eeo eep eer eib eic eie eii ein eio eip eir en- enb enc ene eni enn eno enp enr eo- eob eoc eoe eoi eon eoo eop eor ep- epb epc epe epi epn epo epp epr erb erc ere eri ern ero erp err ibb ibc ibe ibi ibn ibo ibp ibr icb icc ice ici icn ico icp icr ie- iec iee iei ien iep ier iib iic iie iii iin iio iip iir in- inb inc ine ini inn ino inp inr io- iob ioc ioe ioi ion ioo iop ior ipb ipc ipe ipi ipn ipo ipp ipr ir- irb irc ire iri irn iro irp irr n-i nbb nbc nbe nbi nbn nbo nbp nbr ncb ncc nce nci ncn nco ncp ncr ne- neb nec nee nei nen neo nep ner nib nic nie nii nin nio nip nir nnb nnc nne nni nnn nno nnp no- nob noc noe noi non noo nop nor npb npc npe npi npn npo npp npr nrb nrc nre nri nrn nro nrp nrr o-i ob- obb obc obe obi obn obo obp obr oc- ocb occ oci ocn oco ocp ocr oeb oec oee oei oen oeo oep oer oib oic oie oii oin oio oip oir on- onb onc one oni onn ono onp onr oo- oob ooc ooi oon ooo oop oor op- opb opc ope opi opn opo opp opr or- orb orc ore ori orn oro orp orr p-p pbb pbc pbe pbi pbn pbo pbp pbr pcb pcc pce pci pcn pco pcp pcr peb pec pee pei pen peo pep per pib pic pie pii pin pio pip pir pn- pnb pnc pne pni pnn pno pnp pnr pob poc poe poi pon poo pop por ppb ppc ppe ppi ppn ppo ppp ppr prb prc pre pri prn pro prp prr rbb rbc rbe rbi rbn rbo rbp rbr rcb rcc rce rci rcn rco rcp rcr re- reb rec ree rei ren reo rep rer rib ric rie rii rin rio rip rir rnb rnc rni rnn rno rnp rnr rob roc roe roi ron roo rop ror rpb rpc rpe rpi rpn rpo rpp rpr rrb rrc rri rrn rrp rrr