You type "dead key" first then the letter on all OSes and Keyboard maps I've ever used that supports it
The ` beside 1 should always be dead. The " ^ - ~ are typical option dead keys, but I have the UNIX Compose mapped to CAPS, so Compose ^ e = ê, ~ n = ñ Compose " u = ü etc, so I only have `as a dead key.
Windows since 3.1 has Charmap. Linux also has it.
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