built in operator: sreverse

    description:
        sreverse seq
        reverse the given sequence, leaving the order of the kets in the superpositions unchanged

    examples:
        sreverse (|a> . |b> . |c>)
            |c> . |b> . |a>
        
        sreverse (|a> + |b> . |c> + |d> . |e>)
            |e> . |c> + |d> . |a> + |b>
            
        -- reverse the order of the sequence of superpositions:
        long-display sreverse (|a> + |b> . |c> + |d> . |e>)
            seq |0> => |e>
            seq |1> => |c> + |d>
            seq |2> => |a> + |b>
            |e> . |c> + |d> . |a> + |b>
        
        -- reverse both the superpositions and the sequence:
        long-display sreverse reverse (|a> + |b> . |c> + |d> . |e>)
            seq |0> => |e>
            seq |1> => |d> + |c>
            seq |2> => |b> + |a>
            |e> . |d> + |c> . |b> + |a>
        
    see also:
        reverse