According to Erwin Chargaff, for a double stranded DNA

(1) The ratios between Adenine and Thymine, and, Guanine and Cytosine are constant and equals one. 

(2) The ratios between Adenine and Thymine, and, Guanine and Cytosine are constant but is not equal to one. 

(3) The ratios between Adenine and Guanine, and,Thymine, and Cytosine are constant and equals one. 

(4) The ratios between Adenine and Guanine, and, Thymine and, Cytosine are constant but is not equal to one. 

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