Assertion: door | /r/AtLocation | two-wide water flow
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Source sentences:
text: Although primarily used to block movement by mobs and players, a door can also be used to control the movement of boats (for example, a door placed in a two-wide water flow stops a boat when perpendicular to the flow, but allow it to move again when parallel), items and minecarts (a door can stop a falling item or minecart, then allow it to drop again when the door moves), etc.