In the permission scheme you got there is hell lot of a security hole - s and S are suid and sgid whic tell the system to run scripts in the context of the user and group who instantiated the scripts. For instance if a script performs crtical system calls this means that if user A runs this script he might insert some nusty malformed requests into the script, and hence, undermine the security (the capital S with rw gives the user a permission to modify the script, even remove it) of the whole system, you should be very careful with those. The permissions were created with
chmod 6645
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