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goodbye :-
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new(D, window('Goodbye')),
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send(D, size, size(250, 100)),
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new(S, string("Goodbye, World !")),
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new(T, text(S)),
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get(@display, label_font, F),
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get(F, width(S), M),
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XT is (250 - M)/2,
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get(F, height, H),
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YT = (100-H)/2,
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send(D, display, T, point(XT, YT)),
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send(D, open).
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