The target is exactly \(4~\text{favorable}~\text{outcomes}\). Evaluate Cases 1–6, then report the \(\text{complete}~\text{matching}~\text{set}\).

Case 1. A fair coin is flipped \(\text{twice}\); the event is exactly \(\text{one}\) head.
Case 2. Sandwiches use \(1~\text{of}~2\) breads and \(1~\text{of}~5\) fillings; the event is wheat bread.
Case 3. A \(3\text{-}by-2\) tree has \(4\) end outcomes marked favorable.
Case 4. Codes use \(1~\text{of}~\text{four}\) letters \({A,~B,~C,~D}\) and \(1~\text{of}~\text{three}\) digits \({1,~2,~3}\); the event is an even digit.
Case 5. \(\text{One}~\text{of}~3\) colored chips is drawn and a fair coin is flipped; favorable outcomes are red-heads, red-tails, blue-heads, and blue-tails.
Case 6. Outfits use \(1~\text{of}~4\) shirts and black or khaki pants; the event is black pants.

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