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One face, one voice, one habit, and two persons! (5.1.226)

this talks about the confusion in their identity (Viola and Sebastian). This could be linked to identity theft because those two were mistaken for the other causing a whole other chain of events.

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Will you deny me now?
Is ’t possible that my deserts to you
Can lack persuasion?
Do not tempt my misery,
Lest that it make me so unsound a man
As to upbraid you with those kindnesses That I have done for you. (3.4.364-369)
The mistaken identity causes a a friend to feel betrayed, like how Antonio felt when Cesario did not recognize him because Antonio mistook him for Sebastian. For example, in the movie Monte Carlo, the doppelganger ruined some relationships for the actual girl.

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Dear lad, believe it;
For they shall yet belie thy happy years
That say thou art a man. Diana’s lip
Is not more smooth and rubious, thy small pipe
Is as the maiden’s organ, shrill and sound,
And all is semblative a womans part.(1.4.32-37)
This relates to the idea of not being confined to any gender. It explains that sometimes while you are feeling one gender, you wont necessarily be looking like said gender. this is normally known as bi-gender.

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This relates the theme of identity. How gender identity is now being recongnized as transfrmative rather than fixed, which has gained a lot of media attention and controversy. As seen with Bruce Jenner's transition to Caitlyn Jenner.