/usr/share/lyx/kbd/magyar-3.kmap is in lyx-common 2.2.2-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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# Hungarian keyboard definition file for LyX
#
# (c)1996 by István Pál (3.14) <pali@agy.bgytf.hu>
#
# Bindings for Hungarian keyboard using ISO-8859.2 (Latin-2)
# key mapping for LyX.
# Set the Layout/Document/Encoding to latin2
\kmap \\ ű #"{\\H u}"
\kmap | Ű #"{\\H U}"
\kmap [ ő #"{\\H o}"
\kmap { Ő #"{\\H O}"
\kmap ] ú #"{\\'u}"
\kmap } Ú #"{\\'U}"
\kmap ; é #"{\\'e}"
\kmap : É #"{\\'E}"
\kmap ' á #"{\\'a}"
\kmap \" Á #"{\\'A}"
\kmap \` í #"{\\'\\i}"
\kmap ~ Í #"{\\'I}"
\kmap = ó #"{\\'o}"
\kmap + Ó #"{\\'O}"
\kmap - ü #"{\\\"u}"
\kmap _ Ü #"{\\\"U}"
\kmap 0 ö #"{\\\"o}"
\kmap ) Ö #"{\\\"O}"
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