Problem: checkers pattern

Code: checkers+pattern/tails_1642067881

Nibbles version: 0.2 | 0.21 | 0.22 | 0.23 | 0.24 | 0.25 | 1.00

Format: Compact | Simple | +Type | Table | JSON | .nbl (DeBruijn) | .nbl (names)

$ 
. + $ 
    `, ;_ 
  % $ 
    ~