THE ORIGINAL -- HOLDS TEMPORARY NAMES IN MEMORY -- WORKS

# bash -x domains_original.sh words.txt out.txt 2 com 30 30
+ input=words.txt
+ output=out.txt
+ combos=2
+ suffix=com
+ delay=30
+ retries=30
+ array=($(<"$input"))
++ mix 2
++ (( 2 < 1 ))
++ for x in '"${array[@]}"'
+++ mix 1 apple
+++ (( 1 < 1 ))
+++ for x in '"${array[@]}"'
++++ mix 0 appleapple
++++ (( 0 < 1 ))
++++ echo appleapple.com
+++ echo appleapple.com

THE REWRITE -- SUPPOSE TO WRITE TEMPORARY NAMES TO A FILE -- DOESN'T WORK

# bash -x domains.sh words.txt thruput.txt out.txt 2 com 30 30
+ input=words.txt
+ thruput=thruput.txt
+ output=out.txt
+ combos=2
+ suffix=com
+ delay=30
+ retries=30
+ mix 2
+ (( 2 < 1 ))
+ read line
++ mix 1
++ (( 1 < 1 ))
++ read line
+++ mix 0
+++ (( 0 < 1 ))
+++ echo .com
++ echo .com