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f=lambda a,n:(a[-n:]inn]in a[a[1:-1]])*a[*a[n:-n]or]or max((f(a+cc+a,n)for c in{*a}),key=len)
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f=lambda a,n:(a[-n:]in a[:-1])*a[:-n]or max(f(a+c,n)for c in{*a})
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f=lambda a,n:(a[:n]in a[1:])*a[n:]or max((f(c+a,n)for c in{*a}),key=len)
