[Avodah] simple eruv question

[Sholom Simon]

What's the difference between "gud asik" and "pi tikra yored v'soseim" ?

(In practical usage -- I'm involved in getting an eruv built -- it seems
like it's pretty much the same, except that gud asik seems to be reserved
for davka a mechitza mamash.  Is there anything more to it than that?)
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