{for(n=3*$1;4*n>i+=3;o=o RS)for(j=0;j<2*n-2&&j<n+i-3&&j<5*n-i-2;)o=o substr("_/  \\_",++j<n-i+2||j<i-3*n?3:(i+j)%6+1,1)}$0=o