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If overline a,overline b,overline c are ...

If `overline a,overline b,overline c` are vectors of length `4, 4, 5` re-spectively, and `overline a,overline b,overline c` are perpendicular to `overlineb +overline c,c+overlinea, overlinea + overlineb,` then `|overlinea+overlineb+overlinec|=`

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