The hand-internal movement is unusual, as the selected fingers change. In the first handshape, the index finger is selected while in the second handshape, the thumb is selected. According to the ‘selected fingers constraint’, such a hand-internal movement is ruled out. However, the constraint only applies to lexical mono-morphemic signs, not to morphologically complex signs. It is very likely that the Khmer SL sign delicious is a compound made up of the signs eat and good (compare Chapter 9).