Assertion: breakwater | /r/MadeOf | concrete
Facets:
value: usually
type: TEMPORAL
Source sentences:
text: Groins are usually made from concrete, wood or stone, and the spacing between them is determined according to local beach slope and wave energy patterns.
text: It is usually made of large boulders, but it can be made of concrete, steel or wood.
text: Groins are usually made from concrete, wood or stone, and the spacing between them is determined according to local beach slope and wave energy patterns.