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Clear current query
clear()
TRUE (invisible)
query() for a opening a query.
query()
submit() for a submitting a query.
submit()
once() for a opening a query, submitting it, and clearing it again.
once()
findall() for a opening a query, collecting all solutions, and clearing it again.
findall()
query(call("member", expression(X), list(quote(a), "b", 3L, 4))) submit() # X = a submit() # X = "b" clear()
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