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Add ex3
Provided ex4 and started ex5
"if x then True else False" can be written as "x" when x evaluate as a Bool ;)
validate x = mod ( sumDigits (doubleEveryOther (toDigits x))) 10 == 0
"type x = y" actually just creates an alias for "y" named "x". Thus Peg is a String, and "a" is already a String. That means you can call (hanois 1 "a" "b" "c") directly.