printSpaces(initPrintNum+printLevel1), strings.Join(nonmatchingSubsets, ","))
		}
		fmt.Fprintf(writer, "%sMatching subsets: %s\n",
			printSpaces(initPrintNum+printLevel1), strings.Join(matchingSubsets, ","))
		if len(nonmatchingSubsets) > 0 {
			fmt.Fprintf(writer, "%s(Non-matching subsets %s)\n",
				printSpaces(initPrintNum+printLevel2), strings.Join(nonmatchingSubsets, ","))
		}