What two functional groups are represented in the following IR spectrum? 
Definitions:
Tax Purposes
Pertaining to or in order to comply with tax laws and regulations.
Head of Household
Head of Household is a filing status for individual U.S. taxpayers who are unmarried and pay more than half the cost of keeping up a home for themselves and a qualifying person.
Dependent Widowed Mother
A widowed mother who relies on another, typically her child, for financial support and can be claimed as a dependent for tax purposes if certain criteria are met.
Legally Divorced
A status that indicates a person has completed the legal process of divorce, thereby dissolving the marital relationship under law.
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