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$\delta _5^1$
Assuming AD, we show that all of the ordinals below 
$\delta _5^1$ represented by descriptions (c.f. [2], but also defined below) are cardinals. Using this analysis we also get a simple representation for the cardinal structure below 
$\delta _5^1$. As an application, we compute the cofinalitites of all cardinals below 
$\delta _5^1$.
