Assertion: breaststroke | /r/HasProperty | difficult
Facets:
value: typically
type: DEGREE
value: most technically
type: DEGREE
value: the
type: OTHER
Source sentences:
text: The breaststroke is the oldest swimming style already known in ancient times, and also the most technically difficult.
text: While butterfly is commonly depicted as the hardest stroke, breaststroke is typically the most difficult to master.