The proverbs:
The early bird catches the W1.
Where the wolf gets one W2 - he looks for another.
The best horse doesn't always win the W3
.
Better wed over the mixen than over the W4.
The alphametics:
W3+W2=W1
W3-W2=W4
The phrase "The bear came home to the wolf" uses 12 distinct letters, - three of them were not used in the alphametics.
Which three?
What digit was not used in the equations?