The lensing objects for these cases are also unusual - the first lens,
discovered in 1985 and dubbed the "Einstein cross", is a quasar lensed by a
supermassive black hole at the center of a nearby bright galaxy; the other,
discovered in 1988 and dubbed the "clover leaf", is a quasar lensed by an unseen
mass. This highly efficient and cost-effective survey is conducted in "parallel
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