-er bbb bbe bbi bbn bbo bbr bbx be- beb bee bei ben beo ber bex bi- bib bie bii bin bio bir bix bnb bne bni bnn bno bnr bnx bob boe boi bon boo bor box brb bre bri brn bro brr brx bxb bxi bxn bxo bxx ebb ebe ebi ebn ebo ebr ebx eeb eee een eeo eer eex eib eie eii ein eio eir eix en- enb ene eni enn eno enr eo- eob eoe eoi eon eoo eor erb ere eri ern ero err ex- exe exi exo exr exx ibb ibe ibi ibn ibo ibr ibx ie- iee iei ien ier iex iib iie iii iin iio iir iix in- inb ine ini inn ino inr inx io- iob ioe ioi ion ioo ior ir- irb ire iri irn iro irr irx ixe ixi ixn n-i nbb nbe nbi nbn nbo nbr nbx ne- neb nee nei nen neo ner nex nib nie nii nin nio nir nix nnb nne nni nnn nno no- nob noe noi non noo nor nox nrb nre nri nrn nro nrr nrx o-i ob- obb obe obi obn obo obr obx oeb oee oei oen oeo oer oex oib oie oii oin oio oir on- onb one oni onn ono onr onx oo- oob ooi oon ooo oor oox or- orb ore ori orn oro orr orx ox- oxb oxi oxn oxo oxx rbb rbe rbi rbn rbo rbr rbx re- reb ree rei ren reo rer rex rib rie rii rin rio rir rix rnb rni rnn rno rnr rob roe roi ron roo ror rox rrb rri rrn rrr rxr xbe xbr xbx xee xen xer xex xie xii xin xio xix xno xoi xon xoo xor xox xrx xxi xxo xxx