sentences: when a openings preposition rarefactions a wheel preposition , ergonal growing occurs
docs: if stand occurs then arise occurs. if scale_up occurs then increase occurs. if top_out occurs then rise occurs. juxtaposition is placement. if push occurs then press occurs. if drape occurs then fold occurs. if slalom occurs then zigzag occurs. if cling occurs then attach occurs. if zigzag occurs then turn occurs. if line_up occurs then wait occurs.