-er bbb bbd bbe bbi bbo bbr bbs bbx bdb bdd bde bdi bdo bdr bds bdx be- beb bed bee bei beo ber bes bex bi- bib bid bie bii bio bir bis bix bob bod boe boi boo bor bos box brb brd bre bri bro brr brs brx bsb bsd bse bsi bso bsr bss bsx bxb bxd bxi bxo bxx dbb dbd dbe dbi dbo dbr dbs dbx ddb ddd dde ddi ddo ddr dds ddx de- deb ded dee dei deo der des dex di- dib did die dii dio dir dis dix dob dod doe doi doo dor dos dox drb drd dre dri dro drr drs drx dsb dsd dse dsi dso dsr dss dsx dxd dxi dxo dxr dxs dxx ebb ebd ebe ebi ebo ebr ebs ebx ed- edb edd ede edi edo edr eds edx eeb eed eee eeo eer ees eex eib eid eie eii eio eir eis eix eo- eob eod eoe eoi eoo eor eos erb erd ere eri ero err ers es- esb esd ese esi eso esr ess esx ex- exd exe exi exo exr exs exx i-d ibb ibd ibe ibi ibo ibr ibs ibx idb idd ide idi ido idr ids idx ie- ied iee iei ier ies iex iib iid iie iii iio iir iis iix io- iob iod ioe ioi ioo ior ios ir- irb ird ire iri iro irr irs irx is- isb isd ise isi iso isr iss ixe ixi o-i ob- obb obd obe obi obo obr obs obx odb odd ode odi odo odr ods oeb oed oee oei oeo oer oes oex oib oid oie oii oio oir ois oo- oob ood ooi ooo oor oos oox or- orb ord ore ori oro orr ors orx os- osb osd ose osi oso osr oss osx ox- oxb oxi oxo oxx rbb rbd rbe rbi rbo rbr rbs rbx rdb rdd rde rdi rdo rdr rds rdx re- reb red ree rei reo rer res rex rib rid rie rii rio rir ris rix rob rod roe roi roo ror ros rox rrb rrd rri rrr rrs rsb rsd rse rsi rso rsr rss rsx rxr rxs sbb sbd sbe sbi sbo sbr sbs sbx sdb sdd sde sdi sdo sdr sds se- seb sed see sei seo ser ses sex sib sid sie sii sio sir sis six sob sod soe soi soo sor sos sox sr- srb srd sre sri sro srr srs srx ss- ssb ssd sse ssi sso ssr sss ssx sxi sxs xbe xbr xbx xdb xde xdi xdr xds xed xee xer xes xex xie xii xio xis xix xod xoi xoo xor xos xox xrd xrx xsb xsi xss xxi xxo xxx