classes:  lecturer. You know, when you study and you don't know what you're doing, when you do and you don't know what you're doing, it's like a blind man walking in the dark.  curriculum. You know, when you study and you don't know what you're doing, when you do and you don't know what you're doing, it's like a blind man walking in the dark.  facility. You know, when you study and you don't know what you're doing, when you do and you don't know what you're doing, it's like a blind man walking in the dark.  general. You know, when you study and you don't know what you're doing, when you do and you don't know what you're doing, it's like a blind man walking in the dark.