##' Example Graphs
##'
##' Some example graphs for illustration.
##'
##' @format These are all `mixedgraph` objects.
##'
"gr1"
##' @describeIn gr1 another graph
"gr2"
##' @describeIn gr1 The instrumental variables graph
"grIV"
##' @describeIn gr1 The Verma graph
"grVerma"
##' @describeIn gr1 Jamie's 'double' Verma graph
"grJamie"
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