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Curtis Greene et al. have a nice package at http://www.haverford.edu/math/cgreene/posets.htmlhttp://ww3.haverford.edu/math/cgreene.html.
Curtis Greene et al. have a nice package at http://www.haverford.edu/math/cgreene/posets.html.
Curtis Greene et al. have a nice package at http://ww3.haverford.edu/math/cgreene.html.
