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a->while(#a&&b!=b=a,a=concat(b));a
Attempt This Online!
f(a)=if(a'===0,[a],#a,concat(apply#a&&a!=b=concat(f,a),f(b),[]a)
Attempt This Online!Attempt This Online!
f(a)=if(a'===0,[a],#a,concat(apply(f,a)),[])
f(a)=if(#a&&a!=b=concat(a),f(b),a)
