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Good luck.

Until the code doesn't product 0:null, change the array size to a small number like 5.

Trace the code to see how values get into variables and then to where the contents of those variables are...

When you pass a variable to a method don't add []s. Just code the variable name.

The code violates coding conventions by having the same symbol for a class and a variable: Supplies.
Variables should start with lowercase.

What is this supposed to mean: Supplies[