Four engineers J, F, H and D are checking a rocket. Each engineer has a switch that

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Four engineers J, F, H and D are checking a rocket. Each engineer has a switch that he or she presses in the event of discovering a fault. Show how these must be wired to a warning lamp, in the countdown control room, if the lamp is to light only under the following circumstances:

(a) D discovers a fault;

(b) Any two of J, F and H discover a fault.

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