In mathematics, a set A is a subset of a set B, or equivalently B is a superset of A, if A is ''contained'' inside B, that is, all elements of A are also elements of B. A and B may coincide. The relationship of one set being a subset of another is called inclusion or sometimes containment. A is a subset of B may also be expressed as B includes A; or A is included in B.
can a set be an element of another set?
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Answer: yes

The National Park Service acquired ownership of the lighthouse when it was abandoned in 1935. Today the Coast Guard owns and operates the navigational equipment, while the National Park Service maintains the tower as a historic structure. The Hatteras Island Visitor Center, formerly the Double Keepers Quarters located next to the lighthouse, elaborates on the Cape Hatteras story and the lifestyle on the Outer Banks. Cape Hatteras Lighthouse, tallest in the United States, stands 208 feet (63 m) from the bottom of the foundation to the peak of the roof. To reach the light, which shines 191 feet (58 m) above mean high-water mark, requires climbing 268 steps. The construction order of 1,250,000 bricks was used in construction of the lighthouse and principal keeper's quarters.
is the cape hatteras lighthouse still in use?
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Answer: no

Little River Band have undergone numerous personnel changes, with over 30 members since their formation. None of the musicians now performing as Little River Band are original members, nor did they contribute to the success the band had in the 1970s. In the 1980s, members included John Farnham, David Hirschfelder, Stephen Housden, Wayne Nelson and Steve Prestwich. Currently the line-up is Nelson with Rich Herring, Greg Hind, Chris Marion and Ryan Ricks. Two former members have died, Barry Sullivan in October 2003 (aged 57) and Steve Prestwich in January 2011 (aged 56).
are there any original members of the little river band?
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- yes
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Answer:
no