-er -ic a-a a-b a-c a-i aaa aab aac aae aai aan aao aar ab- aba abb abc abe abi abn abo abr ac- aca acb acc ace aci acn aco acr aea aeb aec aee aei aen aeo aer ai- aia aib aic aie aii ain aio air an- ana anb anc ane ani ann ano anr aoa aob aoc aoe aoi aon aoo aor ar- ara arb arc are ari arn aro arr baa bab bac bae bai ban bao bar bba bbb bbc bbe bbi bbn bbo bbr bca bcb bcc bce bci bcn bco bcr be- bea beb bec bee bei ben beo ber bi- bia bib bic bie bii bin bio bir bna bnb bnc bne bni bnn bno bnr boa bob boc boe boi bon boo bor bra brb bre bri brn bro brr c-- caa cab cac cae cai can cao car cba cbb cbc cbe cbi cbn cbo cbr cca ccb ccc cce cci ccn cco ccr ce- cea ceb cec cee cei cen ceo cer ci- cia cib cic cie cii cin cio cir cn- cna cnb cnc cne cni cnn cno cnr co- coa cob coc coe coi con coo cor cra crb crc cre cri crn cro crr eaa eab eac eae eai ean eao ear eba ebb ebc ebe ebi ebn ebo ebr ec- eca ecb ecc ece eci ecn eco ecr eea eeb eec eee een eeo eer eia eib eic eie eii ein eio eir en- ena enb enc ene eni enn eno enr eo- eoa eob eoc eoe eoi eon eoo eor era erb erc ere eri ern ero err ia- iaa iab iac iae iai ian iao iar iba ibb ibc ibe ibi ibn ibo ibr ica icb icc ice ici icn ico icr ie- iea iec iee iei ien ier iia iib iic iie iii iin iio iir in- ina inb inc ine ini inn ino inr io- ioa iob ioc ioe ioi ion ioo ior ir- ira irb irc ire iri irn iro irr n-i naa nab nac nae nai nan nao nar nba nbb nbc nbe nbi nbn nbo nbr nca ncb ncc nce nci ncn nco ncr ne- nea neb nec nee nei nen neo ner nia nib nic nie nii nin nio nir nna nnb nnc nne nni nnn nno no- noa nob noc noe noi non noo nor nra nrb nrc nre nri nrn nro nrr o-i oaa oab oac oae oai oan oao oar ob- oba obb obc obe obi obn obo obr oc- oca ocb occ oci ocn oco ocr oea oeb oec oee oei oen oeo oer oia oib oic oie oii oin oio oir on- ona onb onc one oni onn ono onr oo- ooa oob ooc ooi oon ooo oor or- ora orb orc ore ori orn oro orr ra- raa rab rac rae rai ran rao rar rba rbb rbc rbe rbi rbn rbo rbr rca rcb rcc rce rci rcn rco rcr re- rea reb rec ree rei ren reo rer ria rib ric rie rii rin rio rir rna rnb rnc rni rnn rno rnr roa rob roc roe roi ron roo ror rra rrb rrc rri rrn rrr