period of conversion	period of cost recovery	period of credit	period of delay	period of depreciation
period of digestion	period of existence	period of expansion	period of free oscillation	period of gestation
period of grace	period of growth	period of guarantee	period of insurance	period of isometric contraction
period Of isometric relaxation	period of limitation	period of notice	period of operating cycle	period of probation
period of recovery	period of redemption	period of relaxation	period of sampling	period of service

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