In the following list of numbers (given in their binary representations), each number appears an even number of times, except for one number that appears exactly three times. Find the number that appears exactly three times. Leave the answer in its binary representation.
\begin{array}{llllll}
010111 & 000001 & 100000 & 011000 & 110101 & 100001 \\
010100 & 011111 & 111001 & 010001 & 010100 & 101100 \\
010001 & 011011 & 011111 & 011011 & 100000 & 000001 \\
110011 & 001000 & 111101 & 100001 & 101100 & 110011 \\
111111 & 011000 & 001000 & 101000 & 111111 & 101000 \\
010111 & 100011 & 111001 & 100011 & 110101 & 011111 \\
100000 & 010100 & 010001 & 101100 & 010111 & 011011 \\
011000 & 111101 & 111111 & 100001 & 101000 & 100011 \\
011011 & 010111 & 110011 & 111111 & 000001 & 010001 \\
101000 & 111001 & 010100 & 110101 & 011000 & 110101 \\
001000 & 000001 & 100000 & 111101 & 100011 & 001000 \\
111001 & 110011 & 100001 & 011111 & 101100 & \\
\end{array}