The ballots are ratings of options in the range from zero to one.
Once the ballots are in, for each option (i) find the total number t(i) of
ballots that rate it above zero, i.e. t(i) is the cardinality of the set {r
in the set of ballots | r(i) > 0}.
The winning option is the option i for which the sum t(i)+r(i) is greatest on
a randomly drawn ballot r.
Note that if a voter rates only one option at top level 100% and no other
option above zero, then this top option will be selected if this voter's ballot
is drawn.
FWS
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