CHECK FOR UNDERSTANDING: This loop will run once for each letter in the string "PANTHERS".

The string value is letter and stores one value from the string "PANTHERS" each time the loop runs: first "P", then "A", "N", "T", "H", "E", "R" and finally "S". The loop stops after the last value.

Each time the loop runs the current value of letter is added to the string cheer using the += operator.

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