Interlocking modular block system

An interlocking modular block system for structure assembly, comprising:

• a. a solid prestressed concrete post having a square cross-sectional shape;
• b. a first hollow cuboid shaped block of a first size, having a triangular cutout on each of two opposing sides, wherein each triangular cutout is configured to mate with an instance of said post;
• c. a second hollow cuboid shaped block of a second size longer than the first size, having said triangular cutout each of two opposing sides;
• d. a first hollow cubic shaped block with a triangular prism shaped protrusion on each of three consecutive walls, including a square shaped bore configured to securely accept said post, said square shaped bore extending parallel to longitudinal axes of said triangular prism shaped protrusions, wherein said first hollow cubic shaped block is configured to join three walls and wherein said triangular prism shaped protrusion is configured to mate with an instance of said triangular cutout;
• e. a second hollow cubic shaped block with a triangular prism shaped protrusion on each of two opposing walls, including a square shaped bore configured to securely accept said post, said square shaped bore extending parallel to longitudinal axes of said triangular prism shaped protrusions, wherein said second hollow cubic shaped block is configured to join two colinear walls;
• f. a third hollow cubic shaped block with a triangular prism shaped protrusion on one wall, including a square shaped bore configured to securely accept said post, said square shaped bore extending parallel to a longitudinal axis of said triangular prism shaped protrusion, wherein said third hollow cubic shaped block is configured to terminate a wall;
• and
• g. a fourth hollow cubic shaped block with a triangular prism shaped protrusion on each of two consecutive walls, including a square shaped bore configured to securely accept said post, said square shaped bore extending parallel to longitudinal axes of said triangular prism shaped protrusions, wherein said fourth hollow cubic shaped block is configured to join two perpendicular walls.