neon[4], nono[4], nero[4], orne[4], norn[4], oreo[4], noro[4],
eon[3], one[3], non[3], ono[3], ner[3], ren[3], ero[3], nor[3], oro[3],
en[2], eo[2], no[2], on[2], er[2], re[2], or[2], ro[2],
