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##definitions of class unions
setClassUnion("graphNEL_Or_NULL",c("graphNEL","NULL"))
setClassUnion("numeric_Or_integer_Or_NULL",c("numeric","integer","NULL"))
setClassUnion("numeric_Or_integer",c("numeric","integer"))
setClassUnion("character_Or_NULL", c("character", "NULL"))
setClassUnion("numeric_Or_NULL", c("numeric", "NULL"))
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