Problem: Duplicate characters

Code: Duplicate+characters/darrenks_1642094651

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)

+ (concat):[chr] 
    . (map):[[chr]] 
        ;_ (= allInput):[chr] 
        : (append):[chr] <--arg( A:chr ) 
            (implicit arg = A):chr 
            (implicit arg = A):chr