What is the smallest real number $k$ (to 3 decimal places), such that for all ordered triples of non-negative reals $(a,b,c)$ which satisfy $a + b + c = 1$, we have

$\frac{ a}{ \sqrt{1-c} } + \frac{b} { \sqrt{1-a} } + \frac{ c} { \sqrt{1-b} } \leq 1 + k ?$

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