# code: http://golf.shinh.org/reveal.rb?ascii+diagonal/tails_1644973167&nbb
# target Nibbles version: 0.23
# commenter version: 0.1.2.181

! #(zip with):[[chr]] 
    allLines #(;;@):[[chr]] 
    \A 
    , #(range from 1):[int] 
        ~ #(auto = infinity):auto 
    = #(zipop: subscript):null