4 3 2 1 1 4 3 4 3 2
Using the number string above, replace every 1 with the letter A, every 2 with the letter B, every 3 with the letter C, and every 4 with the letter F. For letters that appear more than twice, delete the first instance of those letters. Delete the first and the last letters in the string, and replace the vowels with the letter Z.
Which of the following letter strings corresponds with the directions above?

Question

Quizplus · Accepted Answer

Let's go step-by-step:
4 3 2 1 1 4 3 4 3 2
Step 1: Replace every 1 with the letter A.
4 3 2 A A 4 3 4 3 2
Step 2: Replace every 2 with the letter B.
4 3 B A A 4 3 4 3 B
Step 3: Replace every 3 with the letter C.
4 C B A A 4 C 4 C B
Step 4: Replace every 4 with the letter F.
F C B A A F C F C B
Step 5: For letters that appear more than twice, delete the first instance of those letters.
F C  B A A F C F C B
B A A F C F C B
Step 6: Delete the first and the last letters in the string.
B A A F C F C B
Z Z F C F C
Step 7: Replace the vowels with the letter Z.
Z Z F C F C
The letters that remain are Z Z F C F C.