Why do I imagine these four ladies moving in unison, joined at the hip, baby steps? No matter where they went it was step, step, step. Over to the edge to look over the cliff? Step, step, step. Perhaps they took their act on the road. Let's call them the Hip-sisters. Then again...have there ever been siamese quads?
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If none of the above is true it just means there were four close friends with really bad taste in clothes.