John: Here's the second test. Wendy will read out two lists of words. When she finishes, repeat the words after her. Here's list A.

Wendy: Sit, day, pen, cow, sit.（pause）

John: Now write the words down.（pause）

Here's list B.

Wendy: Man, cat, fat, hat, man.（pause）

John: Now write those words down.（pause）Which list was easier to remember? Yes, list A is easier. Scientists think that list B is harder because the words in list B sound similar.