The result of Ex:ConditionalProcedure is still repetitive in that it uses the same procedure call four times in a row, with only the field name changing. Can you remove even this repetition, so there is only a single procedure call?

Hint 1: What TiddlyWiki feature have we seen that renders some wikitext multiple times?

Hint 2: A type of filter expression we haven't discussed explicitly yet consists of a tiddler list (sequence of tiddler names).