After they are denatured, the two complimentary single strands of DNA shown below can form (at least) three secondary structures upon annealing. Name three of them.
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5'-A-T-G-C-T-G-G-G-G-G-T-A-T-T-G-C-C-C-C-C-T-T-T-A-3'
3'-T-A-C-G-A-C-C-C-C-C-A-T-A-A-C-G-G-G-G-G-A-A-A-T-5'