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all (the) one
1. The same as other options. Voting for a democrat or a republican for president is all one in my opinion; they're both going to lead the country the same way.
2. Making no difference or of no consequence to someone. To be honest, I don't care if we buy the blue or the red sofa; it's all the one to me.
all the same
1. Equally desirable or acceptable. Typically said when choosing between multiple options. If it's all the same to you, I'd rather stay home tonight.
2. Very similar or identical. This phrase can be used literally or hyperbolically. These print-outs are all the same—how am I supposed to collate them? These stupid, poofy prom dresses are all the same! I want something different from the other girls at school.
be all (the) one (to someone)
To make no difference (to someone) one way or another; to be unimportant (to someone) what happens. I'd actually prefer to continue working on a freelance basis, if it's all one to you. It's only a game, after all, so it's all the one whether we win or lose.
Of no difference; immaterial: Whether we go out or stay in, it's all one to me.