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where

where clause is attached to for each loop to limit the items you want to iterate over. It's similar to using if statement inside the loop, for example:
for each msg in web → feed("...")
where msg → message → count > 30
do
Only `msg` longer than 30 characters will get here!
end for each
This will behave the same as:
for each msg in web → feed("...") do
if msg → message → count > 30 then
Only `msg` longer than 30 characters will get here!
else ... end if
end for each