Man relies on _____ to solve problems; a machine employs a _____ approach, ______ trying all possible solutions until one works

In this question, I initially thought that Blank 1 and 2 would be opposites because of the semicolon, signifying supporting ideas instead of contrast. Can someone please help where I went wrong initially or why semicolon is being used for a contrasting idea?

First I solved the last blank: â€ś_____ trying all possible solutions until one worksâ€ť
This is split into â€ś_____ trying all possible solutionsâ€ť + â€śuntil one worksâ€ť. From this I filled in the blank as â€śContinuouslyâ€ť. I couldnâ€™t really figure out a connotation here.

Next for blank 2:
â€śa machine employs a _____ approach, continuously trying all possible solutions until one worksâ€ť
Herd from the comma, its a support and hence chose â€śall roundedâ€ť

Finally for blank 1:
â€śMan relies on _____ to solve problems; a machine employs an all rounded approach, continuously trying all possible solutions until one worksâ€ť
The semicolon again provides support and so I put â€śmachine like approachâ€ť as the answer.