For those who have never played before, here's a link to the Dominion page at the Rio Grande Games website. Near the bottom right of the page is a pdf of the rules, which are a decent length but have an abridged tl;dr version running down a sidebar on the right for people who can't be bothered to read entire paragraphs.
http://www.riograndegames.com/games.html?id=278
If you want the rules for the expansions, poke around their site. There are rules pdfs for those as well.
Lastly, here's a full card list for those who want to see all the cards Tom is talking about.
http://dominion.diehrstraits.com/
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on 4ways: right now they have inherent flaws, but could be easily fixed by implementing approval voting! ~ToadYoshi 1. SoAL 2. MKW/64 3. FE7 4. TF2 5. FFCC