What is the classification of the following polymer in which X and Y represent repeating units? 
Definitions:
Social Security Number
A unique identification number assigned to U.S. citizens and some residents to track earnings and benefits for social security purposes.
Tape-recording
The act of recording sound, especially conversations, onto magnetic tape as a means of keeping a record.
Lay Witness
A witness who testifies in court about what they saw, heard, or know directly, not providing an expert opinion.
Expert Witness
A person with specialized knowledge, skills, or experience in a particular field who provides testimony in legal proceedings to clarify facts at issue.
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