(,^t68^,),or,(,(,^T69^,),andnot,(,^t69.8^,or,^t698^,),),or,(,^T3[3-4]^,),or,(,^Frost^bite^,),or,(,^Exposure^,and,^cold^,),or,(,^frost^,and,^nip^,),or,(,^X31^,)