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The functions fold and fold* are similar to
fold-left* and fold-right* but knil is always the
last argument of the calls to kons.
Left fold the function kons over the elements of the list arguments. Accept lists of different length and stop at the end of the shortest list. At least one of the list arguments must be finite. The syntax may be a little faster than the function when multiple circ arguments are involved.
Right fold the function kons over the elements of the list arguments. Accept lists of different length and stop at the end of the shortest list. At least one of the list arguments must be finite. The syntax may be a little faster than the function when multiple circ arguments are involved.