Hi @Arnold,
get it know. Seems to me what you are trying to do is a bit tricky but you can try following approach: split you column using Cell Splitter By Position into 3’s string and use Create Collection Column to use above mentioned Subset Matcher on same column.
Second approach could be to create 3’s string from your input column (without Cell Splitter By Position) and then create a separate list (column in another table) from it. Then re-use/modify logic from here: row filter
Br,
Ivan