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When vinyl-liner pools first appeared more than half a century ago, they were offered as "standard" pools for middle-class consumers - plain, simple and relatively inexpensive compared to their concrete cousins. Back in the 1950s and '60s, these vinyl-liner packages had squared-off shapes, but as time passed and consumers demanded greater variety, models emerged with oval forms or Grecian-style ends; before long, there were kidney-shaped packages and even some