[tlhIngan Hol] {SaD} {SanID} difference

[mayqel qunen'oS]

Besides the info, that is written in tkd, is there any other info on the
words {SaD} & {SanID} ?

According to tkd, both are more or less "the same", being used with the
same frequency.

But is any one of them, slang ? Or is one more "formal" than the other ?

bara'qa'
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