for (String a2Base : a2Bases) {
for (String a2Category : a2Categories) {
Path a2Dir = Paths.get(a2Base).resolve(a2Category);
if (!Files.exists(a2Dir))
Files.createDirectories(a2Dir);
for (String a2Base : a2Bases) {
for (String a2Category : a2Categories) {
Path a2Dir = Paths.get(a2Base).resolve(a2Category);
if (!Files.exists(a2Dir))
Files.createDirectories(a2Dir);