Assertion: twin flank | /r/CapableOf | upgrade until the august 15th update
Facets:
value: to upgrade to the octo tank
type: PURPOSE
Source sentences:
text: The Twin Flank used to upgrade to the Octo Tank until the August 15th update, this was because the Quad Tank and the Twin Flank both upgraded from the same Tier 2 tank, therefore the Octo Tank already had an upgrade.