let N be non empty with_non-empty_elements set ; :: thesis: for S being non empty COM-Struct of N holds NAT misses Data-Locations S
let S be non empty COM-Struct of N; :: thesis: NAT misses Data-Locations S
Data-Locations S misses {(IC )} \/ NAT by XBOOLE_1:79;
hence NAT misses Data-Locations S by XBOOLE_1:70; :: thesis: verum