This tool takes a mask and inserts each line of a sequence into that mask. Think of it as a sequential search and replace.
{{X}} is each line of the sequence{{#}} is the number of the sequence (ignoring blanks){{#-1}} is the number of the sequence minus 1 (ignoring blanks){{L#}} is the line number of the sequence{{L#-1}} is the line number of the sequence minus 1