It is really hard for me to guess your intention. On one hand you are expressing that each a and b are general public (no major underscore within their names) so I need to theoretically be permitted to obtain/mutate (get/set) both of those. But then you specify an explicit mutator https://smartworlddeveloper.co.in/smart-world-69-sector-69-gurgaon-a-new-benchmark-in-urban-luxury-living/