The ornamental design for the a four pointtenterectionsystem, as shown and described.
FIG. 1 is a top left front perspective view of my four point tent erection system;
FIG. 2 is a top elevational view of my design;
FIG. 3 is a right side elevational view of my design;
FIG. 4 is a front elevational view of my design;
FIG. 5 is a rear elevational view of my design;
FIG. 6 is a left side elevational view of my design; and,
FIG. 7 is a bottom elevational view of my design. The broken lines are for the purpose of illustrating portions of the article that form no part of the claimed design.