Notes :Many problems: phonology (*-m- / -w-?); attribution of IE 'ear'; variation *-ǯ- / -d- in SH; unclear relationship of Sem. *ħzy/w 'see' and NC (Nakh, HU) *χV̆c̣V 'hear'. This and the distinction of two roots in FU suggests that we are dealing with two original roots, hard to distinguish.
