-er a-a a-b a-i a-q aaa aab aae aai aan aaq aar ab- aba abb abe abi abn abq abr aea aeb aee aei aen aeq aer ai- aia aib aie aii ain aiq air an- ana anb ane ani ann anq anr aqa aqi aqn aqr ar- ara arb are ari arn arq arr baa bab bae bai ban baq bar bba bbb bbe bbi bbn bbq bbr be- bea beb bee bei ben beq ber bi- bia bib bie bii bin bir bna bnb bne bni bnn bnr bqe bra brb bre bri brn brq brr eaa eab eae eai ean ear eba ebb ebe ebi ebn ebq ebr eea eeb eee een eer eia eib eie eii ein eir en- ena enb ene eni enn enr eqa eqe eqn eqq era erb ere eri ern erq err ia- iaa iab iae iai ian iaq iar iba ibb ibe ibi ibn ibr ie- iea iee iei ien ier iia iib iie iii iin iir in- ina inb ine ini inn inq inr iqa iqe ir- ira irb ire iri irn irq irr n-i naa nab nae nai nan nar nba nbb nbe nbi nbn nbr ne- nea neb nee nei nen ner nia nib nie nii nin niq nir nna nnb nne nni nnn nra nrb nre nri nrn nrr qaa qan qar qba qbe qbq qee qen qie qin qir qnb qne qni qqq qra qrb qre qri ra- raa rab rae rai ran raq rar rba rbb rbe rbi rbn rbr re- rea reb ree rei ren req rer ria rib rie rii rin riq rir rna rnb rni rnn rnr rqn rra rrb rri rrn rrq rrr