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Mister Spy & Souheyl Bypass Shell

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#W  nilpquot.gi                 GAP Library                     Werner Nickel
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LeftNormedComm := function( list )
    local   n;

    n := Length( list );

    if n = 1 then return list[1]; fi;

    return Comm( LeftNormedComm( list{[1..n-1]} ), list[n] );
end;