Assertion: bottle's base | /r/HasProperty | molded with radial corrugation
Facets:
value: to provide strength
type: PURPOSE
value: to provide the ability
type: PURPOSE
Source sentences:
text: Most modern-day two-liter bottles are one piece of PET (polyethylene terephthalate) with a base that is molded with a radial corrugation to provide strength for the bottom and the ability to stand upright.