Assertion: backstroke's body | /r/AtLocation | the breast
Facets:
value: after each turn
type: TEMPORAL
Source sentences:
text: From the beginning of the first arm stroke after the start and after each turn, the body shall be on the breast.
text: It is not permitted to roll onto the back at any time except at the turn after the touch of the wall where it is permissible to turn in any manner as long as the body is on the breast when leaving the wall.