Question

For example – I have some terms:

moves(1, [1]).
moves(1, [2]).
moves(1, [3]).

How can I get next term?

moves(1, [1,2,3]).

---

% I have
    moves(1, [1]).
    moves(1, [2]).
    moves(1, [3]).

% I need to write some predicate which
    transform_moves :- 
        % ...
        % ...
        assert(moves(Pos, Arr)),

        % moves(1, [1,2,3]).

Answer 1

Program:

:- dynamic moves/2.

moves(1, [1]).
moves(1, [2]).
moves(1, [3]).

transform_moves(Pos) :- 
    findall(Y, moves(Pos, [Y]), L), 
    retractall(moves(Pos, _)),
    assert(moves(Pos, L)).

Call:

?- transform_moves(1).