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well a wrist rein (or whatever they called them) doesn't preclude hand-holding, so it can just be a back-up. When a line of parked cars is between you on the pavement/sidewalk and the moving traffic in the street, you want that rein shorter than the width of a car in case they slip your grasp and wiggle between the parked cars.
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The most difficult thing is the decision to act, the rest is merely tenacity Amelia Earhart
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