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Added direct product stub.
Added discussion of how graph-of-groups decompositions are natural for subgroups of amalgamated products and HNN extensions.
fix example tag
close EXAMPLE tag
add discussion of dihedral group and euclidean group to semidirect product examples.
Temporary spacing fix
I changed the title, as too many of the listed constructions are not really products in any reasonable sense.
Added tensor products to the list
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