prov:value
| - carbons, R2 is a methyl, ethyl, or propyl group, R3 is a methyl, ethyl, or propyl group, R4 is a methyl, ethyl or propyl group, X is a counterion, and R2, R3, and R4 together contain a total of at least 4 carbon atoms; and (b) at least one second water-soluble polymer different from said first polymer.
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