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\section{Abbreviations}
\label{sec:abbreviations}
\begin{description}
\item[HNF]
Head normal form, the state of a graph node that cannot be rewritten itself (though it children may).
\item[ISA]
Instruction set architecture.
\item[IT block]
If-then block, a Thumb construct for conditional execution.
\item[LSB(s)]
Least significant bit(s), the bit(s) with the lowest value in a word.
\item[PC]
Program counter, \ual{r15} on ARM.
\item[RTS]
Run-time system.
Clean's run-time system ensures that the \clean{Start} node is reduced and printed.
It also takes care of garbage collecting.
\item[SP]
Stack pointer, \ual{r13} on ARM.
\item[UAL]
Unified Assembler Language.
%todo
\end{description}
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