040000 tree 2b009843fe3b6744454d1c1368e73f568b6bd893	common
040000 tree bf4f5608548fd463d543cf49903bbb1d1c17bc16	communication
040000 tree 9102433e94ccd18595b2d564316e671630dba5b9	controller
040000 tree 9fae9d87da91d7b9be065014023e90c7a8f989a7	exceptions