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Different legal expert systems may be incompatible with each other: A user in characterizing the same situation by answering the questions presented in a consultation can be led to contradictory inferences. Such systems can be ”synthesized’ to help users avoid such contradictions by alerting them that other relevant systems are available to be consulted as they are responding to questions. An example of potentially incompatible, related legal expert systems is presented here - ones for the New Jersey murder statute and the celebrated Quinlan case, along with one way of synthesizing them to avoid such incompatibility.