Here is the order you should use the Absolut Repair Molecular products:

Step 1 - L’Oréal Absolut Repair Molecular Pre-Treatment Spray
Step 2 - L’Oréal Absolut Repair Molecular Shampoo
Step 3 - L’Oréal Absolut Repair Molecular Professional Rinse-Off Serum
Step 4 - L’Oréal Absolut Repair Molecular Leave-In Mask