Definition:
Concatenation is the joining of two numbers by their numerals. That is, the concatenation of 123 and 456 is 123456.
Concatenation of numbers A and B is denoted A||B.
Puzzle:
Find a perfect square of 12 digits formed from the concatenation of two perfect squares, one having 4 digits and the other 8 digits. None of the three perfect squares can begin with a zero.
A is a 4-digit number, B an 8-digit number making C a 12-digit number, all in base 10.
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