Hi,
  Does ConTeXt have anything equivalent to xleftarrow, xrightarrow of 
amsmath. Basically, I need a command that can do

A \xleftarrow[subscript]{superscript} B

should give

    superscript
A <----------- B
    subscript

and similar for xrightarrow, xleftrightarrow, xLeftarrow, xRightarrow 
and xLeftRightarrow.


The closest that I could come to it was (only for superscripts)

\def\xrightarrow#1{\buildrel{#1}\over\longrightarrow}

But this is not extendable.

\xrightarrow{big superscipt}


Any suggestions?

Aditya

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