plot letter grid by llhuii

{A[(q=$1-8)>a?a=q:q<b?b=q:q,(q=$2-8)>c?c=q:q<d?d=q:q]=$3}END{for(;b-k<=a||k=c>=++d;)printf(q=A[b-k--,d])?q:k?"-":RS}

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

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