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backbone - n. the most important or strongest part of something
refundable tax credit –n. a tax credit that people can claim that is not tied to how much tax they have to pay
consequential –adj. important
check –n. (often) a piece of paper representing a payment from someone to someone that is carried out through a bank
promote –v. to make people aware of something; to make something more popular
provision –n. a condition that is included as part of an agreement or law
