only add one spacer per upstream node
only add one spacer per upstream node

...not one per edge coming from the upstream node

pivotal-devin-fallak/atc,utako/atc,zachgersh/atc,zachgersh/atc,pivotal-devin-fallak/atc,utako/atc,zachgersh/atc,zachgersh/atc,pivotal-devin-fallak/atc,simonjjones/atc,savaki/atc,savaki/atc,simonjjones/atc,utako/atc,simonjjones/atc,savaki/atc