Some of them aren't implemented, some of them are. Just because it's blank doesn't mean it's not working. Shadow step type spells just teleport you around in the current zone, they work, they are client side.
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++[>++++++<-]>[<++++++>-]<.>++++[>+++++<-]>[<
+++++>-]<+.+++++++..+++.>>+++++[<++++++>-]<+
+.<<+++++++++++++++.>.+++.------.--------.>+.
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