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Once had a copy of APL: an interactive approach and taught it to myself in high school. Went to the Griffith House at Fernbank in Decatur where they had an APL terminal hooked up to a mainframe that ran APL. Sat down and wrote a program in APL. Worked perfectly after a bit of debugging. Got up to get a drink of water. Sat back down and couldn't read what I'd written. APL is a Write-Only language.