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fmincon stopped because the size of the current search direction is less than
twice the default value of the step size tolerance but constraints were not
satisfied to within the default value of the constraint tolerance.
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Optimization stopped because the norm of the current search direction , 2.244999e-014, is less
than twice the default value of options.TolX = 1.000000e-006, but the maximum constraint
violation, 4.640455e-006, exceeds the default value of options.TolCon = 1.000000e-006.

Optimization Metric                                           User Options
norm(search direction) =  2.24e-014                         TolX =  1e-006 (default)
max(constraint violation)  =  4.64e-006                   TolCon =  1e-006 (default)

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