The first time: A has three choices (EPDM).

The second time: the person with the ball has three choices (A and the remaining two), and the discussion begins here.

A: A take the ball.

Three choices for the third time

Two choices for the fourth time, because if A takes the ball for the fourth time, he can't pass it to himself.

The fifth time, there is only one choice.

B: EPDM ball holding rules

The third time, the three options were discussed again.

B- 1 A take the ball.

Three choices for the fourth time

The fifth choice

B-2 EPDM rubber ball rules

Two choices for the fourth time

The fifth choice

Total times:

Route a: 3×13× 2×1=18.

B- 1 Route: 3× 2×1× 3×1=18.

Route B-2: 3× 2× 2× 1 = 24

There are 60 ways to add up.