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Symbol subtraction and addition bug?

Stockcharts allows subtraction of one symbol from another. So “spy-iwm” is allowed. You can also do “SPY-@mysymbol” where the @ is a user-defined index. But you cannot do “@mysymbol1-@mysymbol2” or “@mysymbol- SPY.” In other words, if a user-defined index is BEFORE the minus song, your chart produces no data.

I’m guessing this is a bug. Any way around it?

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