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I would seriously think about changing that. First having to watch 10 guys walk down & then 10 girls, by time you make your entrance it would be like "Finally" Consider having the guys & girls both pair up to make the procession go a little faster. With exception of maybe best man and maid of honor
If you're planning to have them walk slowly (i.e. normal wedding procession speed so that the photog can take pictures, etc) then pair them up.Now, if you're having them book it high speed down the aisle, I guess together or separate wouldn't matter!