plant identification update

Hello!
A huge thank you to everyone who helped us identify plants or weeds in our yard, see here.
Here are some better photos of some of the 'trees' we have not yet identified ...
Update- we have identified most of the plant life now.

Plant 1- box elder

* the above leaves belong to the 'tree' below

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Plant 2- Cottonwood

* the leaves above are from the tree below

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Plant 3- ???

* the leaves above are from the tree below

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Plant 4- ???

* the leaves above are from the tree below


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