What is texture(iChannel0,vec2) equivalence in Core Image Kernel Language?

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float r = texture(iChannel3, view1).r;
float g = texture(iChannel3, view2).g;
float b = texture(iChannel3, view3).b;

fragColor = vec4(r, g, b, 1.);

How Can I Convert this shader syntax in Core Image Kernel Language?

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