Sentence:  As one would surmise , the procedure , however , could be repeated with the same object or with the same type of object often enough , so that the corresponding visual <WSD>blots</WSD> and the merest beginning of the tracing movement would provide clues as to the actual shape , which the patient then immediately could determine by a kind of inference . 
Meaning of the word marked with <WSD> tags:  a blemish made by dirt