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A look at the top 20 high school softball teams in the Southland as ranked by CalHiSports.com for The Times. Rk.; Last ranking; School; Record 1. (1) Murrieta Mesa 18-0 2. (2) Norco 17-2 3. (3) Fullerton 18-2 4. (4) Etiwanda 17-1 5. (5) La Mirada 18-2 6. (6) Ganesha 11-2 7. (7) Orange Lutheran…