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When you define A, the (1,4)(2,3) looks using the tuple (1,4) as a function to be called at (2,3), which explains your error.

If you want A be a list of elements of G you must make it explicit:

sage: A=[G((1,2)), G((1,3,2)), G((1,4)), G([(1,4),(2,3)]),G((2,4)),G((2,4,3)),G((3,4)),G((2,3,4))]

sage: A
[(1,2), (1,3,2), (1,4), (1,4)(2,3), (2,4), (2,4,3), (3,4), (2,3,4)]

Then, you can do:

sage: b=[G((1,5))*a for a in A]
sage: b
[(1,5,2),
 (1,5,3,2),
 (1,5,4),
 (1,5,4)(2,3),
 (1,5)(2,4),
 (1,5)(2,4,3),
 (1,5)(3,4),
 (1,5)(2,3,4)]