**Complete to solve $7 + 66$.**
$\phantom{=}7+66$
$=(3+$ [[☃ input-number 1]]$)+ 66$
$=3+ ($[[☃ input-number 2]] $+ 66)$
$=3 + $ [[☃ input-number 3]]
$=$ [[☃ input-number 4]]
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