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IF overlinea=2overlinei+3overlinej+4over...

IF `overlinea=2overlinei+3overlinej+4overlinek,overlineb=overlinei+overlinej-overlinek,overlinec=overlinei-overlinej+overlinek`, compute `overlineax(overlinebxoverlinec)` and verify that it is perpendicular to `overlinea`

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