BEGIN {
			while(getline x < F) {
				if(x ~ /@attribute/) {
					split(x,attribute," ");
					if(attribute[2] ~ /^'/) {
						attribute[2]=substr(attribute[2],2,length(attribute[2])-2);
					}
					if(attribute[3] ~ /^'/) {	
						split(attribute[3],poss,",");
						count=0;
						for(p in poss) {
							count++;
						}
						for(i=1;i<=count;i++) {
							if(i==1) {
								poss[i]="{"substr(poss[i],3,length(poss[i])-3);
								sub(" ","",poss[i]);
								out=poss[i]
							}
							else if(i==count) {
								poss[i]=substr(poss[i],2,length(poss[i])-3)"}";
								sub(" ","",poss[i]);
								out=out","poss[i]
							}
							else {
								poss[i]=substr(poss[i],2,length(poss[i])-2);
								sub(" ","",poss[i]);
								out=out","poss[i]
							}
						}
						print attribute[1]" "attribute[2]" "out
					}
					else
						print x
				}				
				else if((x !~ /^[ \t]*$/)&&(x !~ /@attribute/)&&(x !~ /@data/)&&(x!="")&&(x !~ /@relation/)&&(x !~ /^%/)) {
					split(x,line,",");
					count=0;
					for(c in line) {
						count++;
					}
					for(j=0;j<=count;j++) {
						if(line[j] ~ /^'/) {
							line[j]=substr(line[j],2,length(line[j])-2);
							sub(" ","",line[j]);
						}
						if(j==1)
							out=line[j]
						else
							out=out","line[j]
					}

					print out
				}
				else 
					print x
			}
			close(F);
}