\line should be used inside the picture environment. Use
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which writes a black rectangle wd wide, hg high and located at dp from the baseline. If wd is "big" and hg is "small", you get an horizontal line. For example, \rule{2cm}{0.4pt} draws an horizontal line 2cm long, having a thickness of 0.4pt; \rule[-5pt]{2cm}{0.4pt} draws the same line 5pt below the baseline.