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- Return destination?: Abbr.
- Grp. that launches investigations
- Taxing abbreviation?
- Tax grp.
- It's over in Oct.
- It starts in early Apr.
- Spring-ahead letters
- April addressee
- Org. with a complex code
- Timezone letters
- Spring collector: Abbr.
- April abbr.
- Largest U.S. collection agcy.
- 1040 org.
- Recipient of many unhappy returns