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sub a { @_<2 ? @_ : (pop,shift,&b) }
sub b { @_<2 ? @_ : (shift,pop,&a) }
print a(1..8), "\n";

sub a { @_ ? (@_[-1,0,1,-2],a(@_[2..$#_-2])) : () }
print a(1..8), "\n";

sub a { @_ ? (pop,shift,shift,pop,&a) : () }
print a(1..8), "\n";