1 ?- X = 123.
X = 123.
2 ?- X
| .
% ... 1,000,000 ............ 10,000,000 years later
%
% >> 42 << (last release gives the question)
2 ?- X.
% ... 1,000,000 ............ 10,000,000 years later
%
% >> 42 << (last release gives the question)
2 ?- Z = 123.
Z = 123.
3 ?- Z.
% ... 1,000,000 ............ 10,000,000 years later
%
% >> 42 << (last release gives the question)
3 ?-