Learn a DAG with undirected graph as starting point

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I have an undirected graph (i.e. a set of undirected arcs). Bnlearn package doesn't seem to allow to learn from an undirected graph/network. For eg giving undirected graph for 'start' parameter in hill-climbing hc() function gives error "the graph is only partially directed". Is there a way to learn a directed acyclic graph (DAG) from an undirected graph either using bnlearn or any other package in R ? Thanks in Advance.

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