**Complete to solve $159 + 221$.**
$\phantom{=}159+221$
$=(150+$ [[☃ input-number 1]]$)+ 221$
$=150 + ($[[☃ input-number 2]] $+ 221)$
$=150 + $ [[☃ input-number 3]]
$=$ [[☃ input-number 4]]
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