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Exception from liability for, and crediting of, contributions.
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7.—Regulations may provide for—
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(a) making exceptions from the liability to pay contributions for any specified periods, and
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(b) crediting contributions to insured persons for any specified periods, including, in particular—
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(i) periods for which there is an exception from the liability to pay contributions by virtue of paragraph (a) of this section, and
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(ii) the period between the beginning of the contribution year last preceding that in which they become insured persons and their entry into insurance.
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