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I think the word is "alternating". There was a row of trees bordering each side of the road, each row alternating every other tree as Ash and Oak.
Answer
#4: Attribution notice removed
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#3: Attribution notice added
Source: https://writers.stackexchange.com/a/43185 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/