premise: How to smooth frizzy hair<br>Wash with a moisturizing shampoo. Frizz is often caused by dryness, so it's important to restore moisture to your hair in the shower. Always use a sulfate-free shampoo.
hypothesis: Always use a shampoo-free shampoo.
reason: I replaced sulfate with shampoo. This statement is obviously incorrect because it tries to state that you should use shampoo without using shampoo.