instruction plan of pre-stressed for section 3C
concretehttps://docs.google.com/document/d/1t0wNVD8GVIg8DStxYftZCcktKiDetasQyb0b6oopITY/edit?usp=sharing
concretehttps://docs.google.com/document/d/1t0wNVD8GVIg8DStxYftZCcktKiDetasQyb0b6oopITY/edit?usp=sharing
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