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plain) (
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if \1
<letter \1> : "\1"
else if \2
<letter \2> : "\2"
else
<letter \3> : "\3"
end if
<letter a> : "a"
# (if (@ 1 0-2) ‘\1’
# (.inner
# (map (@ 2 2-2)
# (.sequence
# (keys (@ 2 2-13) ‘<letter \1>’)
# )
# (.result
# (string (@ 2 16-20) ‘"\1"’)
# )
# )
# )
# (.otherwise
# (if (@ 3 3-7) ‘\2’
# (.inner
# (map (@ 4 4-4)
# (.sequence
# (keys (@ 4 4-15) ‘<letter \2>’)
# )
# (.result
# (string (@ 4 18-22) ‘"\2"’)
# )
# )
# )
# (.otherwise
# (map (@ 6 4-4)
# (.sequence
# (keys (@ 6 4-15) ‘<letter \3>’)
# )
# (.result
# (string (@ 6 18-22) ‘"\3"’)
# )
# )
# )
# )
# )
# )
# (map (@ 8 0-0)
# (.sequence
# (keys (@ 8 0-10) ‘<letter a>’)
# )
# (.result
# (string (@ 8 13-16) ‘"a"’)
# )
# )
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