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1. \(K_4\) does not have an Euler path or circuit.

2. \(K_5\) has an Euler circuit (so also an Euler path).

3. \(K_{5,7}\) does not have an Euler path or circuit.

4. \(K_{2,7}\) has an Euler path but not an Euler circuit.

5. \(C_7\) has an Euler circuit (it is a circuit graph!)

6. \(P_7\) has an Euler path but no Euler circuit.