For the application of the provisions of sub-sections 1 to 3, the following are not considered to be sub-contractors:
1° Members of the same grouping in relation to each other;
2° Economic operators over whom the contract holder exercises, directly or indirectly, a dominant influence within the meaning of the second paragraph of Article L. 1212-2;
3° Economic operators who may exercise a dominant influence, within the meaning of the second paragraph of Article L. 1212-2, over the contract holder;
4° Economic operators who, together with the contract holder, are subject to the dominant influence, within the meaning of the second paragraph of Article L. 1212-2, of a single economic operator.