fix strict hard mode pool bug with double letters

wordle

@@ -318,9 +318,8 @@ function check_guess() {
       yellows[c]="${_char}"         # volatile - stores previous row yellows
       YELLOWS[$_row,$c]="${_char}"  # stores all yellow from all rounds
       BOARD[$_row,$c]="${YELLOW}${BOLD}${LETTER} ${_char} ${UNBOLD}"
-    else
-      POOL="${POOL/${_char}/_}"
     fi
+
     [[ " ${yellows[*]} " =~ ${_char} ]] && continue
     [[ " ${greens[*]} " =~ ${_char} ]] && continue
     POOL="${POOL/${_char}/_}"