uniform half4 colorGreen, colorRed;

half4 main(float2 coords) {
    float result = 0;
    float3x3 g = float3x3(float2x3(1));           result += g[0][0];
    float3x3 h = float3x3(float3x2(1));           result += h[0][0];
    float4x4 i = float4x4(float4x3(float4x2(1))); result += i[0][0];
    float4x4 j = float4x4(float3x4(float2x4(1))); result += j[0][0];
    float2x4 k = float2x4(float4x2(1));           result += k[0][0];
    float4x2 l = float4x2(float2x4(1));           result += l[0][0];

    return result == 6 ? colorGreen : colorRed;
}