The best way to learn proper English is to read news report, and watch news on TV. Watching TV shows is a great way to learn casual English, slang words, understand culture reference and humor. If you have already watched these shows then you may recall the words used in the following dialogs.

Uh, Captain Kirk
activated the self-destruct SEQUENCE...
The Big Bang Theory Season 4, Episode 21

COMPUTER:
Self-destruct sequence activated.
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COMPUTER:
Self-destruct sequence activated.
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COMPUTER:
Self-destruct SEQUENCE activated.
The Big Bang Theory Season 4, Episode 21

Initiating rotation SEQUENCE.
The Big Bang Theory Season 8, Episode 22

Initiating calibration SEQUENCE.
The Big Bang Theory Season 8, Episode 22

Activate self-destruct SEQUENCE.
Code 1, 1A, 2B.
The Big Bang Theory Season 4, Episode 21