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In short, how do I perform a 50% / 50% randomization?

I have six groups: right-polarized (control and treatment), non-polarized (control and treatment), and left-polarized (control and treatment). I use a feeling thermometer based on a formula of 0-to-10 scales measuring how much the respondent sympathizes with former president Bolsonaro and president Lula.If the score given to Lula is higher than Bolsonaro’s, and the difference is greater than or equal to 8, the respondent is assigned to the left-polarized group (and here I need randomization so that 50% go to control and 50% to treatment).If the score given to Bolsonaro is higher than Lula’s, and the difference is greater than or equal to 8, the respondent is assigned to the right-polarized group (here I also need 50/50 randomization between control and treatment).If the respondent does not fit either of the two previous cases, they are assigned to the non-polarized group (again with 50/50 randomization between control and treatment).