You use the beam with the largest riding weight, usually located
on the back beam, and then move on to the next to the largest
rider, etc.
Nice grammar.
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The noun 'rafter' is a singular, common, concrete noun; a word for a support beam of a structure, a word for a thing; a word for someone riding a raft, a word for a person.
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Tee beam, L beam & Inverted beam
tayyab..
there are many other types of beam such as cantilever beam ,
simply supported beam . t beam . knife edge beam and many more