diff --git a/dlibrary/dlibrary.py b/dlibrary/dlibrary.py
index f3f3dd6..f6d4e7a 100755
--- a/dlibrary/dlibrary.py
+++ b/dlibrary/dlibrary.py
@@ -27,9 +27,10 @@ FANZA_ID_REGEX = re.compile('^d_[0-9]+$')
 FAKKU_ID_REGEX = re.compile('.*_FAKKU$')
 
 TEXTLESS_REGEX = re.compile('(台詞|セリフ|せりふ|テキスト|文字)((な|無)し|抜き)|notext|textless', re.IGNORECASE)
-EPILOGUE_REGEX = re.compile('after|後日談', re.IGNORECASE)
+EPILOGUE_REGEX = re.compile('after|後日談|おまけ', re.IGNORECASE)
 HI_RES_REGEX = re.compile('高解像度', re.IGNORECASE)
-COVER_REGEX = re.compile('表紙|cover|hyoushi', re.IGNORECASE)
+FRONT_COVER_REGEX = re.compile('(^|[^裏])表紙|cover|hyoushi', re.IGNORECASE)
+BACK_COVER_REGEX = re.compile('裏表紙', re.IGNORECASE)
 ALT_VERSIONS = [
     '褐色',
     '日焼け',
@@ -525,14 +526,14 @@ def collate_from_paths(srcs, dest, start_index, exclude):
     if textless_split != False:
         return textless_split
 
+    cover_split = try_collate_split_regex(srcs, dest, start_index, exclude, earlier=FRONT_COVER_REGEX, later=BACK_COVER_REGEX)
+    if cover_split != False:
+        return cover_split
+
     epilogue_split = try_collate_split_regex(srcs, dest, start_index, exclude, later=EPILOGUE_REGEX)
     if epilogue_split != False:
         return epilogue_split
 
-    cover_split = try_collate_split_regex(srcs, dest, start_index, exclude, earlier=COVER_REGEX)
-    if cover_split != False:
-        return cover_split
-
     if all(src.is_file() and is_image(src) for src in srcs):
         ordering = complete_prefix_number_ordering(srcs)
         if ordering:
@@ -854,7 +855,7 @@ argparser.add_argument(
 )
 subparsers = argparser.add_subparsers(title="subcommands", required=True)
 
-parser_extract = subparsers.add_parser('extract', help='extract zipfiles')
+parser_extract = subparsers.add_parser('extract', aliases=['x', 'ex'], help='extract zipfiles')
 parser_extract.add_argument(
     '-r', '--remove',
     action='store_true',
@@ -869,7 +870,7 @@ parser_extract.add_argument(
 )
 parser_extract.set_defaults(func=extract)
 
-parser_fetch = subparsers.add_parser('fetch', help='fetch metadata and thumbnails')
+parser_fetch = subparsers.add_parser('fetch', aliases=['f', 'fet'], help='fetch metadata and thumbnails')
 parser_fetch.add_argument(
     '-l', '--locale',
     type=str,
@@ -882,6 +883,7 @@ parser_fetch.set_defaults(func=fetch)
 
 parser_collate = subparsers.add_parser(
     'collate',
+    aliases=['c', 'co', 'col'],
     help='collate each work into a sequence of image files',
     formatter_class=argparse.RawDescriptionHelpFormatter,
     description=textwrap.dedent("""\
@@ -928,6 +930,7 @@ parser_collate.set_defaults(func=collate)
 
 parser_manual_collate = subparsers.add_parser(
     'manual-collate',
+    aliases=['mc', 'man', 'manual'],
     help='collate a single work manually',
     formatter_class=argparse.RawDescriptionHelpFormatter,
     description=textwrap.dedent("""\
@@ -970,11 +973,11 @@ parser_manual_collate.add_argument(
 )
 parser_manual_collate.set_defaults(func=manual_collate)
 
-parser_analyze = subparsers.add_parser('analyze', help='analyze an extracted folder to assist in collation')
+parser_analyze = subparsers.add_parser('analyze', aliases=['a', 'an', 'anal'], help='analyze an extracted folder to assist in collation')
 parser_analyze.add_argument('work_id')
 parser_analyze.set_defaults(func=analyze)
 
-parser_metadata = subparsers.add_parser('metadata', help='view or modify metadata for a work')
+parser_metadata = subparsers.add_parser('metadata', aliases=['m', 'me', 'meta'], help='view or modify metadata for a work')
 parser_metadata.add_argument('work_id')
 parser_metadata.add_argument(
     '--virtual',
@@ -985,6 +988,7 @@ parser_metadata.set_defaults(func=metadata)
 
 parser_generate = subparsers.add_parser(
     'generate',
+    aliases=['g', 'gen'],
     help='generate HTML/CSS/JS for library site',
     formatter_class=argparse.RawDescriptionHelpFormatter,
     description=textwrap.dedent("""\