build tree recursively, for now disregard distances
build tree recursively, for now disregard distances

bmesuere/uni-test,unipept/unipept,bmesuere/uni-test,bmesuere/uni-test,bmesuere/uni-test,unipept/unipept,unipept/unipept,bmesuere/uni-test,unipept/unipept,unipept/unipept