The DNA was not known until 1984 when Dr. Alik Jeffries, a geneticist at the University of Leicester, London, said in a paper that genetic material may be repeated several times, repeating itself in random, incomprehensible sequences. He continued his research until one year later, that these sequences were unique to each individual and could not be similar. Between two and only in identical twins; even the possibility of similarity between two genotypes between one person and another is one in a trillion, making similarities impossible because the Earth's population does not exceed the six billion. Dr. Alec recorded a patent discovered in 1985, The name "DNA Fingerprint", and defined as "a tool N means to identify the person by comparing the sections "(DNA)", sometimes called the DNA edition "DNA typing".