nnk nnl nnn nra nrb nrc nrd nre nri nrk nrl nrn nrr nrx nxc nxd nxl ra- raa rab rac rad rae rai rak ral ran rar rax rba rbb rbc rbd rbe rbi rbk rbl rbn rbr rbx rca rcb rcc rcd rce rci rcl rcn rcr rcx rda rdb rdc rdd rde rdi rdl rdn rdr rdx re- rea reb rec red ree rei rek rel ren rer rex ria rib ric rid rie rii rik ril rin rir rix rkb rkc rke rkk rla rlc rld rle rli rll rln rlr rna rnb rnc rnd rni rnn rnr rra rrb rrc rrd rri rrk rrl rrn rrr rxr xaa xac xad xak xal xan xar xbc xbe xbl xbr xbx xcb xcd xci xcl xcr xcx xda xdb xdc xde xdi xdk xdr xed xee xel xen xer xex xia xic xie xii xin xix xkb xke xkl xla xlb xld xli xlr xna xnc xnk xrc xrd xrx xxi xxl xxx