-er bbb bbe bbn bbq bbr bbs be- beb bee ben beq ber bes bnb bne bnn bnr bns bqe brb bre brn brq brr brs bsb bse bsn bsr bss ebb ebe ebn ebq ebr ebs eeb eee een eer ees en- enb ene enn enr ens eqe eqn eqq eqs erb ere ern erq err ers es- esb ese esn esq esr ess nbb nbe nbn nbr nbs ne- neb nee nen ner nes nnb nne nnn nns nqs nrb nre nrn nrr nrs nsb nse nsn nsr nss qbe qbq qbs qee qen qnb qne qns qqq qrb qre qrs qsr rbb rbe rbn rbr rbs re- reb ree ren req rer res rnb rnn rnr rns rqn rqs rrb rrn rrq rrr rrs rsb rse rsn rsq rsr rss sbb sbe sbn sbq sbr sbs se- seb see sen seq ser ses snb sne snn snr sns sqn sqq sqr sqs sr- srb sre srn srq srr srs ss- ssb sse ssn ssq ssr sss