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Grandpa knows he’ll always manage, because there are two things in life in which Grandpa’s faith is unwavering: mathematics and his grandson. His grandpa is next to him and is incredibly old, of course, so old now that people have given up and no longer nag him to start acting like an adult. It’s the one thing in his life which won’t ever leave him. She was the first person in his life that he couldn’t work out, though he spent every minute of it after that day trying.