Writer<'a, 'L>
bind (arg1, arg2)
'a
'b
Writer<'a, 'b>
flatMap fx _arg1
'a -> Writer<'b, 'c>
Writer<'a, 'c>
Writer<'b, 'c>
map fx _arg1
'a -> 'b
run _arg1
'a * List<'b>
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