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 F u n c t i o n :   i s H a s h (   s t r i n g   ) 
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 D e s c r i p t i o n :   C h e c k s   i f   a   h a s h   t a g   i s   b o u n d   t o   a n   a s s o c i a t e d   D C   o b j e c t   w i t h   a   m a t c h i n g   i d . 
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 R e t u r n s :   T r u e   i f   y e s ,   F a l s e   o t h e r w i s e . 
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 E x a m p l e : 
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 v a r   i s V a l i d   =   $ A . i s H a s h ( " s t r i n g T o C h e c k " ) ; 
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 