If you can carefully translate this pseudocode, the problem will be solved.

*// copy all the prizecards into the scrambled arraylist*

make a counting **loop** with i from 0-39

**get** a prizeCard from position i and **add** it to the scrambled ArrayList.

*// repeat 40 times, pick a card, pick a random place to put it, swap the cards*

make a counting **loop** with i from 0-39

int **pick** = a random number from 1 to 40

int **other** = 0

if pick is an **odd** number, other = a random odd number from 1 to 39 *(20 different numbers, 2 apart, starting at 1)*

if pick is a **multiple of 10**, other = a random number choice of 10,20,30 or 40 *( 4 different numbers, 10 apart, starting at 10)*

**else** *// pick a random even number from 2 to 38 that does NOT include 10,20,30 or 40*

int tens = a random number from 0 to 3

int ones = a random, even number from 2 to 8

int **other** = tens*10 + ones;

*// swap the cards*

PrizeCard **temp** = **get** the card at location pick-1 in the scrambled arraylist

**set** the card at location pick-1 to be the one you **get** from poisition other - 1

**set** the card at location other-1 to be **temp**

*// finished, return the scrambled arraylist*

return scrambled