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Given a positive integer \$n\$ output an ASCII hexagon with diagonal side length \$n\$, as pictured (note there are \$2n\$ _ characters on the top edge)
Examples:
\$n = 1\$
__
/ \
\__/
\$n = 2\$
____
/ \
/ \
\ /
\____/
\$n = 5\$
__________
/ \
/ ...