Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Alignment Elimination from Adams' Grammars   Adams' extension of parsing expression grammars enables specifying
indentation sensitivity using two non-standard grammar constructs ---
indentation by a binary relation and alignment. This paper proposes a
step-by-step transformation of well-formed Adams' grammars for elimination of
the alignment construct from the grammar. The idea that alignment could be
avoided was suggested by Adams but no process for achieving this aim has been
described before.

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The categories of this paper are: q-alg
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The categories of this paper are: eess
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The categories of this paper are: hep-ex
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The categories of this paper are: stat
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The categories of this paper are: atom-ph
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The categories of this paper are: chao-dyn
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The categories of this paper are: math-ph
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The categories of this paper are: supr-con
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The categories of this paper are: cmp-lg
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The categories of this paper are: alg-geom
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The categories of this paper are: solv-int
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The categories of this paper are: math
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The categories of this paper are: funct-an
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The categories of this paper are: nucl-ex
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The categories of this paper are: plasm-ph
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The categories of this paper are: adap-org