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choice = input("[1] Single Phase -- [2] Three Phase");
radius = input("Enter radius: ");
distance = input("Enter distance: ");

if (choice == 1)
    
    L = (2 * 10^-7) * log(distance / radius * exp(-0.25));

elseif (choice == 2)
    sym = input("Sym ? [Press Enter or Type No]");
    
    if (sym == 1)
        L = (2 * 10^-7) * log(distance / radius * exp(-0.25));

    elseif (sym == 2)
        dds = input("Enter List of distances: ");
        distance = dds(1) * dds(2) * dds(3) ^ 0.3;
        L = (2 * 10^-7) * log(distance / radius * exp(-0.25));

    end
else
    L = "error";
end

disp("L = "+ L);