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BSD 4.3
procedure teq(a1,a2)
local i
if *a1 ~= *a2 then fail # check sizes
if a1[1] ~== a2[1] then fail # check values
every i := 2 to *a1 do # check subtrees
if not teq(a1[i],a2[i]) then fail
return a2
end
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