Caveat: I've not tried it, but question: why would you want ligatures in a mono-spaced font? I'm assuming it's mono-spaced? (Not intended as any sort of knock on your choice, I'm just truly curious.)
Answering my own question: I see that you are (probably) referring to the "ligatures" for various symbol character combinations -- not the traditional typographic ligatures for sequences such as "fi" or "tt". (I worked at a typesetting company many years ago. :-) )
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