period of days period of decline period of deep period of delay period of depression period of detention period of development period of drought period of economic period of economic growth period of effectiveness period of eligibility period of employment period of exile period of expansion period of exposure period of extreme period of fasting period of financial period of five days period of five years period of four months period of four years period of gestation period of global period of grace period of great period of greatest period of growth period of guarantee period of heavy period of high period of history period of human period of illness period of implementation period of imprisonment period of inactivity period of incubation period of independence period of ineligibility period of instability period of insurance period of intense period of intensive period of interest period of january period of japan period of japanese period of learning period of leave period of life period of limitation period of low period of major period of maximum period of military period of months period of mourning period of my life period of national period of nine months period of not less than period of notice period of observation period of occupation period of office period of one period of one hour period of one month period of one week period of one year period of only period of operation period of oscillation period of peace period of personal period of political period of pregnancy period of preparation period of probation period of prosperity period of protection period of public period of quiet period of rapid period of rapid growth period of recession period of reconstruction period of recovery period of reflection period of relative period of research period of residence period of rest period of retention period of revolution period of rotation period of separation