Statements: Only wires are switches.
No wire is a board.
Only nuts are boards.
Conclusions: I. All switches are wires.
II. All boards are nuts.
III. All nuts are boards.
IV. No switch is a board.
Only wires are switches can be written in two ways = Some wires are switches (I) and All switches are wires (A). Hence, conclusion I will follows. Only nuts are boards ⇒ All boards are nuts. Hence, conclusion II will follows. Only nuts are boards = Some nuts are boards (I) and All boards are nuts (A). Hence, conclusion II will follow but conclusion III will not follow. All switches are wires (A) + No wire is a board (E) ⇒ No switch is a board(O). Hence, conclusion IV will follow.
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