Assertion: mast's top | /r/HasProperty | 1/4 to 1/3 of the way
Facets:
Source sentences:
text: This is not the masthead "crow's nest" of the popular imagination – above the mainmast (for example) is the main-topmast, main-topgallant-mast and main-royal-mast, so that the top is actually about 1/4 to 1/3 of the way up the mast as a whole.