1 2 3 4 5 6 7dup \ *** Stack underflow 1 2 .s cr \ <2> 1 2 2drop 3 4 .s cr \ <2> 3 4 drop .s cr \ <1> 3 2drop \ *** Stack underflow .s cr \ <0>
1 2 3 4 5 6 7
dup \ *** Stack underflow 1 2 .s cr \ <2> 1 2 2drop 3 4 .s cr \ <2> 3 4 drop .s cr \ <1> 3 2drop \ *** Stack underflow .s cr \ <0>