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Ashe is probably my favorite ADC champion. Her abilities allow for easy escapes, along with great initiates. Pretty much anyway you cause damage with Ashe also slows the enemy. So you dont have to waste an item slot for frozen mallet. I have used this build more times then i can count, and it works pretty exceptionally. The only time it doesnt work is if you have someone else at bot stealing your farm, or if you are just being overly dominated by your opponent, in that case build more sustain, and some gp 10's woiuld probably help too. This build has won me more than a few games, and hopefully it will help you too.
P.S. im sorry i don't have very many pictures, i am new to this build making, so i'm not quite sure how or where to find great pictures to use.
P.S. this build is not even close to finished, but i published it so people could see the item rune and mastery build, thank you for viewing and for giving feedback, please comment any questions, problems, or concerns, you have with the build, i am open to any form of feedback, whether it be positive or negative..... Thnak You.

The runes i choose for ashe give her a boost in attack damage, and attack speed, because those are the two things i see to be most important when using Ashe.
Good alternatives for the runes are as follows:
Any sustain runes such as armor or magic resistance are good substitutes if you are going to be harassing more than normal.
Also any armor penetration would be good because Ashe is pretty much primary Attack Damage, except for her ult.
Also any mana or mana regeneration runes would be good substitues too, because she is extremely mana hungrey in early game, and some mid game, depending on how long it takes to get out of lane and work on team fights.