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List of available TikZ libraries with a short introduction
Multiple arrows between nodes

I am new to tikz. I want to know how to draw this kind(given in the figure) of arrows? And how to put common input lines for two buffers? I want to draw something like this :

enter image description here

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marked as duplicate by Marco Daniel, percusse, cmhughes, Harish Kumar, Peter Grill May 26 '12 at 6:47

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I think a good starting point for this could be this question; moreover you will find more link related to similar stuff in the comments. –  Claudio Fiandrino May 25 '12 at 16:17
    
See: tex.stackexchange.com/a/42679/5239 –  Marco Daniel May 25 '12 at 16:27
    
This question lists a few different arrows types: Graph into graph with arrows, and for resizing arrows see meta arrow tips. –  Peter Grill May 25 '12 at 19:04

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