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\documentclass{article}
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\lxDeclare[role=ID]{$a$}%
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\lxDeclare[role=ID]{$b$}%
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\lxDeclare[role=ID]{$c$}%
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\lxDeclare[role=ID]{$d$}%
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\lxDeclare[role=ID]{$e$}%
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\section{Grouping in multi-relations}
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\paragraph{But period is somewhat different!}
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\section{Arrows as meta-relation}
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\[ a=b \rightarrow c\le d=e \]
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\[ a=b,c \rightarrow d=e \]
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\[ a=b \leftrightarrow c\le d=e \]
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\[ a=b,c \leftrightarrow d=e \]
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\section{Other Meta relations}
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\[ a = b + c + d (< e) \]
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\[ a = b + c + d \mod e \]