Teacher: In this task, you're given a pair of sentences, sentence 1 and sentence 2, that neither agree with nor contradict each other. Your job is to alter sentence 2 so that the pair clearly agree with each other. Generated sentences must be short, with less than 15 words. New information can be introduced. Avoid using pronouns to confuse the subject of the sentence.
Teacher: Now, understand the problem? If you are still confused, see the following example:
Sentence 1: Jon saw his friend Tom coming out of the grocery store with a bag of fruit. Sentence 2: Tom had been shopping for fruit to give Jon.
Solution: Tom had gone into the store before he was seen by Jon.
Reason: Tom must have gone into the store to come out of it.

Now, solve this instance: Sentence 1: a black dog splashes in the water. Sentence 2: a dog chases a koi in a pond
Student:
a dog moves about in water