There is tge malay language they can use to communicate between one another.easy to use and learn. Myanmar, nepalese, banglas all can speak malay within weeks landing on the shores.
that world history was and is still being written in sg.
powers that be are playing with fire by thinking they can densify limited space with rodents from various (sub) continents fresh off the boat and hoping they will co-exist harmoniously in less than one generation. it's a matter of time deep-shitted prejudices hit the fan, and when they do they will blame sinkies for not accommodating these rodents and grooming them to becum more tolerant of differences. heck, walk around any 6.9th generation hokkien heartland, and they still call other dialect groups genitalia names. what more another racial or ethnic group. so called "racial and or ethnic harmony" mantra in sg is a myth. remove the basic comfort and convenience of water, makan and power (and ac), and all hell breaks lose.