Interesting. Never heard of SETL before. There is even a Wikipedia entry: https://en.wikipedia.org/wiki/SETL. References 1 and 2 confirm that it was indeed used to implement the first validated Ada compiler. Didn't know that.
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Another factoid: It was actually SNOBOL (later SPITBOL from Dewar, who was a founder and president of Ada Core), not AWK, that was the first language to offer "associative arrays", which are simply called "tables".
I like the story why they renamed from SEXI to SNOBOL, see https://en.wikipedia.org/wiki/SNOBOL#Naming.