Assertion: breaststroke | /r/HasProperty | the most challenging stroke
Facets:
value: to master
type: PURPOSE
value: for all of these reasons
type: CAUSE
value: for most young children
type: OTHER
Source sentences:
text: For most young children breaststroke is the most challenging stroke to learn.
text: For all of these reasons, breaststroke is the most difficult stroke to teach and learn.
text: Breaststroke is the most challenging stroke to master.