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Find a parity check matrix for the [12,4] repetition code.

1.- Find a parity check matrix for the [12,4] repetition code.
Can you expalin what does mean repetition code and the parity check matrix?

2.- Show that the complement of each codeword in the [12,4] repetition code is again a codeword.
Note: do not do this problem by checking all the sums of codewords.

Please Can you do some sums computation to understand it?

Please can you explain them step by step in order to understand it.
If it is possible give some examples.
I am confused with this terminology.

Thank you so much

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