Assertion: cockatoo's cage | /r/MadeOf | stainless steel
Facets:
Source sentences:
text: Cockatoos need a strong cage made of wrought iron or stainless steel, which is necessary to withstand the cockatoo's tough beak.
text: You should buy strong cages made of wrought iron, stainless steel, etc., as cockatoos have a very tough beak.