GMAT
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Total cloud inversion, which looks like a sea of clouds, occurs above the Grand Canyon about once every decade but had rarely been captured on film until recently.
occurs above the Grand Canyon about once every decade but had rarely been captured
occurs about once every decade but had rarely been captured above the Grand Canyon
appear above the Grand Canyon about once every decade although rarely captured
appear about once every decade above the Grand Canyon, although rarely having been captured
appear about once every decade above the Grand Canyon, which has rarely been captured
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