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        use Quantum::Superpositions BINARY => [ CORE::index ];
 
        print index( any("opts","tops","spot"), "o" );
        print index( "stop", any("p","s") ); 
 
 
=head1 BACKGROUND
 
Under the standard interpretation of quantum mechanics, until they are observed, particles exist only as a discontinuous probability 
function. Under the Cophenhagen Interpretation, this situation is often visualized by imagining the state of an unobserved particle to be 
a ghostly overlay of all its possible observable 
states simultaneously. For example, a particle 
that might be observed in state A, B, or C may 
be considered to be in a pseudo-state where 
it is simultaneously in states A, B, and C.
Such a particle is said to be in a superposition of states.
 
Research into applying particle superposition 
in construction of computer hardware is already well advanced. The aim of such 
research is to develop reliable quantum 
memories, in which an individual bit is stored