?- consult('listgen.pro').
% listgen.pro compiled 0.01 sec, 0 bytes

Yes
?- incList(4,9,L).

L = [4, 5, 6, 7, 8, 9, 10, 11, 12]

Yes
?- incList(22,3,L).

L = [22, 23, 24]

Yes
?- incList(-5,3,L).

L = [-5, -4, -3]

Yes
?- decList(5,5,L).

L = [5, 4, 3, 2, 1]

Yes
?- decList(0,8,L).

L = [0, -1, -2, -3, -4, -5, -6, -7]

Yes
?- decList(12,9,L).

L = [12, 11, 10, 9, 8, 7, 6, 5, 4]

Yes
?- addList(5,5,5,L).

L = [5, 10, 15, 20, 25]

Yes
?- addList(12,6,2,L).

L = [12, 14, 16, 18, 20, 22]

Yes
?- addList(12,6,10,L).

L = [12, 22, 32, 42, 52, 62]