This helped explain why the compass needle always pointed to the north-south direction.
(This; helped; explain why the compass needle always pointed to the north-south direction) Context(This helped,List([0, 11))):(This; helped explain; why the compass needle always pointed to the north-south direction) Context(This helped explain,List([0, 19))):(the compass needle; pointed; to the north-south direction; T:always)
This helped,List([0, 11)) This helped explain,List([0, 19))
This This the compass needle
helped helped explain pointed
explain why the compass needle always pointed to the north-south direction
why the compass needle always pointed to the north-south direction
to the north-south direction T:always