a. Barak contributes to his H. R. 10 plan (i. e., a retirement plan for a self-employed individual). b. Keith pays child support to his former wife, Renee, for the support of their son, Chris. c. Judy pays professional dues that are not reimbursed by her employer. d. Ted pays $500 as the monthly mortgage payment on his personal residence. Of this amount, $100 represents a payment on principal, and $400 represents an interest payment. e. Oni, a private citizen, pays a moving company for moving her household goods (a qualified moving expense) to Detroit, where she is starting a new job. She is not reimbursed by her employer. f. Ralph pays $6,000 of property taxes on his personal residence and $5,000 of state income taxes.