An opinion poll is conducted among a state's electorate to determine the relationship between their income levels and their stands on a proposition aimed at reducing state income taxes. Voters are classified as belonging to either the low-, middle-, or upper-income group. They were asked to indicate their political affiliations—Democrat, Republican, or Independent. Let the letters L, M, and U represent the low-, middle-, and upper-income groups, respectively, and let the letters D, R, and I represent Democrat, Republican, or Independent, respectively. (Enter your answers using letter combinations separated by commas. Example: LD, MR, ...)
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