  Arguments are essential objects in DirectDemocracyP2P, where they can occur
both in association with signatures for petitions, or in association with other
debated decisions, such as bug sorting by importance. The arguments of a signer
on a given issue are grouped into one single justification, are classified by
the type of signature (e.g., supporting or opposing), and can be subject to
various types of threading.
  Given the available inputs, the two addressed problems are: (i) how to
recommend the best justification, of a given type, to a new voter, (ii) how to
recommend a compact list of justifications subsuming the majority of known
arguments for (or against) an issue.
  We investigate solutions based on weighted bipartite graphs.
