Research Purpose:
Research Purpose: Research Purpose: Research Purpose: Research Purpose: Research Purpose:Research Purpose: Research Purpose: Research Purpose: Research Purpose: Research Purpose: Research Purpose:Research Purpose: Research Purpose: Research Purpose: Research Purpose: Research Purpose: Research Purpose: Research Purpose. Research Purpose: Research Purpose: Research Purpose: Research Purpose: Research Purpose:Research Purpose: Research Purpose: Research Purpose: Research Purpose: Research Purpose: Research Purpose:Research Purpose: Research Purpose: Research Purpose: Research Purpose: Research Purpose: Research Purpose: Research Purpose.
1. Directional Flow
2. Multi-Directional Flow