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`bar(a),bar(b),bar(c)` are three vectors such that `|bar(a)|=1,|bar(b)|=2,|bar(c)|=3` and `bar(b),bar(c)` are perpendicular to each other.If the projection of `bar(b)` along `bar(a)` is same as that of `bar(c)` along `bar(a)` then `|bar(a)-bar(b)+bar(c)|` is equal to

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