Question: Decrypt the ciphertext using LFSR with the following rule and seed. Enter one character per box. Rule: To obtain the next bit of the key

Decrypt the ciphertext using LFSR with the following rule and seed.
Enter one character per box.
Rule: To obtain the next bit of the key stream, XOR the fourth-to-last and second-to-last bits.
Seed: 1011
ciphertext: U,IS

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