| http://www.w3.org/ns/prov#value | - and mixtures thereof; R1 is a unit capable of having a negative charge at a pH of from about 4 to about 12; R2 is a unit capable of having a positive charge at a pH of from about 4 to about 12; n has a value such that said zwitterionic polymers suds stabilizer has an average molecular weight of from about 1,000 to about 2,000,000 daltons; x is from 0 to 6; y is 0 or 1; and z is 0 or 1; wherein R1
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