Search for the most parsimonious tree island treating NAs as missing data and save all the topologies from the island and the score.
execute $MATRIX.nex
hsearch addseq=random nreps=1000
savetrees /file=$MATRIX.tre
Then combine both matrix and trees into $MATRIX.tre
execute $MATRIX.nex
Pscores /scorefile=$MATRIX.NAmiss.score
Pset GapMode=newstate
Pscores /scorefile=$MATRIX.NAextr.score
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