The operation "☀" is defined as, $1$☀$6 = 1 + 3 + 5 +7 + 9 + 11 = 36$,  $2$☀$3 = 2 + 4 + 6 = 12$ , $3$☀$5 = 3 + 5 + 7 + 9 + 11 = 35$ .  According to the rules above, calculate: $1$☀$10$. 
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