Answer
Split $[6,3,1,9]$ into $[6,3]$ and $[1,9]$
Split $[6,3]$ into $[6]$ and $[3]$ and split $[1,9]$ into $[1]$ and $[9]$
To merge $[6]$ with $[3] :$ compare $6>3$ then $61$ then $9$
Work Step by Step
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