Question

click to correct the homophone if needed.
when using a double bridle to guide a horse, the rider controls four rains, which are connected to two bits, or bars of metal, in the horses mouth.
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Explanation:

The word "rains" is incorrect here. The correct homophone related to horse bridle equipment is "reins", which are the straps used to control a horse. So we need to replace "rains" with "reins".

Answer:

When using a double bridle to guide a horse, the rider controls four reins, which are connected to two bits, or bars of metal, in the horse's mouth.