Oh no, looks like this tutorial is incomplete.

Feel free to play with the Raku REPL to the right.

Check out these examples!

• [1,2,3] Z [4,5,6]
• [1,2,3] Z~ [4,5,6]
• [1,2,3] X [4,5,6]
• sub postfix:<!>(Int $n) {[*] 2..$n;}; 6!