Directions of the star road by nn

$(i=FS=_)=$0{for(j+=20-j%20;$++i;)r[j++]=$i}END{for(k=20;l<9;){for($(r[k]=l=FS=" ")="-1 2 19 -40 -1 2 38 2 - - | | \\ / / \\";l++<9&&r[k+=$l]!="*";);printf$(l+8)}}

Note that non-ascii characters in the above source code will be escaped (such as \x9f).

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