* The summer is January or February or December * The autumn is March or April or May * The winter is June or July or August * The spring is September or October or November * The workday is Monday or Tuesday or Wednesday or Thursday or Friday * The weekend is Saturday or Sunday

* The season_group is summer or autumn or winter or spring. * The day_group is workday or weekend.

* It is necessary that season has exactly one season_group * It is necessary that day has exactly one day_group

* It is necessary that in spring on business_hours thermostat_setting is ’20 degree’. * It is necessary that in spring on not_on_business_hours thermostat_setting is ’15 degree’. * It is necessary that in summer on business_hours thermostat_setting is ’24 degree’. * It is necessary that in summer on not_on_business_hours thermostat_setting is ’27 degree’. * It is necessary that in autumn on business_hours thermostat_setting is ’20 degree’. * It is necessary that in autumn on not_on_business_hours thermostat_setting is ’16 degree’. * It is necessary that in winter on business_hours thermostat_setting is ’18 degree’. * It is necessary that in winter on not_on_business_hours thermostat_setting is ’14 degree’.