The number of distinct real value of lam...

The number of distinct real value of `lambda`, for which the vector `-lambda^2overset(^)i+overset(^)j+overset(^)k,overset(^)i-lambda^2overset(^)j+overset(^)k and overset(^)i+overset(^)j-lambda^2overset(^)k` are coplanar,is

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