# [APL (Dyalog)], 43 bytes

<!-- language-all: lang-apl -->

    '#',{6⍴(≢⍵)⊃'0'⍵,⍵(2/⍵)(∊⍵,¨⊃⌽⍵)(⍵,⌽⍵)⍵}1↓⍞

[Try it online!]

[APL (Dyalog)]: https://www.dyalog.com/
[Try it online!]: https://tio.run/##SyzI0U2pTMzJT///qG@qp/@jtgkGXI862tP@qyur61SbPerdovGoc9Gj3q2aj7qa1Q3UgSwdINYw0geJaTzq6AKJHFoBlH3UsxciBlICYQNxreGjtsmPeuf9B5r6XwEM0riUueAsAwTTBMFMQzATDZEUI4lbWiLYhokWCI6RkTGSQWlIWgyNjJGsSzE3M0fwkpKSTJEsTUxKSkayFwQQXGNzM5NUNC6qNSamZkhusABBAA "APL (Dyalog Unicode) – Try It Online"