Android 18 can have some pretty complex combos due to her ability to call in 17 to assist in her combos.
Basic Bread and Butter Combo[]
Using this combo can show you the basics of how to use 17 in your combos.
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After the 214M, delay the super-dash slightly so when you connect with the opponent you're high enough up to do the 5M, 5L, 5L, 2H followup.