INPUT
1 2 3 4 tuck   .s clearstack 
1 2 3 4 over   .s clearstack 
1 2 3 4 2 roll .s clearstack 
1 2 3 4 2 pick .s clearstack 
OUTPUT
<5> 1 2 4 3 4
<5> 1 2 3 4 3
<4> 1 3 4 2
<5> 1 2 3 4 2