These shuffle words tend to make code difficult to read and to reason about. Code that uses them should almost always be rewritten using Lexical variables or Dataflow combinators.

Duplicating stack elements deep in the stack:

dupd ( x y -- x x y )

Permuting stack elements deep in the stack:

swapd ( x y z -- y x z )

rot ( x y z -- y z x )

-rot ( x y z -- z x y )