# code: http://golf.shinh.org/reveal.rb?Sum+the+deltas/tails_1644218201&nbb
# target Nibbles version: 0.23
# commenter version: 0.1.2.181

- #(subtract):int 
    / #(foldr1):int 
        _ #(= ints):[int] 
        @ #(= A):int <--arg( B:int A:int ) 
    / #(foldr1):int 
        _ #(= ints):[int] 
        #(implicit arg = D):int <--arg( D:int C:int )