use op as input source instead of index number in vex

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in vex functions, it usually starts by calling the geometry input stream (0,1,..). I'm trying to find a way where I don't have to use the index, so I don't need to hook the wrangle with bunch of wires. Doc says you can use “op” to find the node as input, but when I tried to do so, it'll won't return anything.
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vex_function("op:../node_name", other_arg, etc.);

post hip if you still can't get what you want.
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