\begin{definition}[Definition:Collation/Unique Readability]
Let $\CC$ be a collation system.
Let $\AA$ be an alphabet.
Suppose that for any two collations from $\CC$, $C$ and $C'$, in the alphabet $\AA$, it holds that:
:If $C$ and $C'$ are indistinguishable, then $C = C'$.
Then $\CC$ has the '''unique readability property''' for $\AA$.
\end{definition}