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GSL_CONST_MKSA_INCHThe length of 1 inch.
GSL_CONST_MKSA_FOOTThe length of 1 foot.
GSL_CONST_MKSA_YARDThe length of 1 yard.
GSL_CONST_MKSA_MILEThe length of 1 mile.
GSL_CONST_MKSA_MILThe length of 1 mil (1/1000th of an inch).