3APL is a historical programming language created in 1998.

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Example code from Wikipedia:

PLANBASE { SetStatus(started); }
PR-RULES {
	goTo(R) <- location(R,X,Y) AND NOT at(X,Y) | {
		NowAt(X,Y);
	}
	clean(R) <- location(R,X,Y) AND at(X,Y) | {
		Clean(R);
	}
}
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Last updated February 11th, 2019