a grammar with delete?

[nebnebben]

Hi

Can you help me?

Got a grammar: ?-g(X,[]).

%%%%%%%%%%%%%%%%%%%%%%%%%

g --> c.

c --> [ok_1],[ok_2],[ok_3].

%%%%%%%%%%%%%%%%%%%%%%%%%

Result:

X=[ok_1, ok_2, ok_3]

no (more) answers

but:

%%%%%%%%%%%%%%%%%%%%%%%%%

g --> c.

c --> [ok_1],[ok_2],[ok_3].

% ?? delete ??

%%%%%%%%%%%%%%%%%%%%%%%%%

so that the Result is:
_

X=[ok_2, ok_3]

no (more) answers
_

without changing the query.