Using a variable list and a stem name cannot be mixed. When the panel generator encounters a variable control character a substitution is done. Simple variable lists are substituted in the same order as listed. For example, the third variable control character is replaced with the third variable listed for that control character. The stem variable is replaced by appending a three-character number (tail) to the stem name. The number starts at 1 and is incremented as that stem control character is encountered. Therefore, the tenth stem control character for a particular stem would have a 10 as the tail (STEM.10). Since these variables are REXX variables, they must follow the REXX variable naming rules.