diff --git a/epitran/adapters/__init__.py b/epitran/adapters/__init__.py
deleted file mode 100644
index 28204d8..0000000
--- a/epitran/adapters/__init__.py
+++ /dev/null
@@ -1,2 +0,0 @@
-# Adapters for Regrets regression testing
-# These wrap instance methods into standalone functions that Regrets can call.
diff --git a/epitran/adapters/deu_transliterate.py b/epitran/adapters/deu_transliterate.py
deleted file mode 100644
index c3afc43..0000000
--- a/epitran/adapters/deu_transliterate.py
+++ /dev/null
@@ -1,12 +0,0 @@
-"""Adapter: German (deu-Latn) transliteration for Regrets."""
-from epitran.simple import SimpleEpitran
-
-_epi = SimpleEpitran('deu-Latn', preproc=True, postproc=True, ligatures=False)
-
-def transliterate(text, normpunc=False, ligatures=False):
-    """Transliterate German text to IPA."""
-    return _epi.transliterate(text, normpunc, ligatures)
-
-def general_trans(text, filter_func, normpunc=False, ligatures=False):
-    """General transliteration with filter function."""
-    return _epi.general_trans(text, filter_func, normpunc, ligatures)
diff --git a/epitran/adapters/fra_transliterate.py b/epitran/adapters/fra_transliterate.py
deleted file mode 100644
index bec63bd..0000000
--- a/epitran/adapters/fra_transliterate.py
+++ /dev/null
@@ -1,12 +0,0 @@
-"""Adapter: French (fra-Latn) transliteration for Regrets."""
-from epitran.simple import SimpleEpitran
-
-_epi = SimpleEpitran('fra-Latn', preproc=True, postproc=True, ligatures=False)
-
-def transliterate(text, normpunc=False, ligatures=False):
-    """Transliterate French text to IPA."""
-    return _epi.transliterate(text, normpunc, ligatures)
-
-def general_trans(text, filter_func, normpunc=False, ligatures=False):
-    """General transliteration with filter function."""
-    return _epi.general_trans(text, filter_func, normpunc, ligatures)
diff --git a/epitran/adapters/puncnorm_adapter.py b/epitran/adapters/puncnorm_adapter.py
deleted file mode 100644
index 7354c6c..0000000
--- a/epitran/adapters/puncnorm_adapter.py
+++ /dev/null
@@ -1,8 +0,0 @@
-"""Adapter: PuncNorm for Regrets."""
-from epitran.puncnorm import PuncNorm
-
-_pn = PuncNorm()
-
-def norm(text):
-    """Normalize punctuation in text."""
-    return _pn.norm(text)
diff --git a/epitran/adapters/rules_adapter.py b/epitran/adapters/rules_adapter.py
deleted file mode 100644
index 2118783..0000000
--- a/epitran/adapters/rules_adapter.py
+++ /dev/null
@@ -1,8 +0,0 @@
-"""Adapter: Rules for Regrets — empty rules for basic test."""
-from epitran.rules import Rules
-
-_rules = Rules([])
-
-def apply(text):
-    """Apply context-sensitive rules to text."""
-    return _rules.apply(text)
diff --git a/epitran/adapters/spa_strict_trans.py b/epitran/adapters/spa_strict_trans.py
deleted file mode 100644
index 810cd0a..0000000
--- a/epitran/adapters/spa_strict_trans.py
+++ /dev/null
@@ -1,12 +0,0 @@
-"""Adapter: Spanish strict transliteration for Regrets."""
-from epitran.simple import SimpleEpitran
-
-_epi = SimpleEpitran('spa-Latn', preproc=True, postproc=True, ligatures=False)
-
-def strict_trans(text, normpunc=False, ligatures=False):
-    """Strict transliteration — unmapped characters omitted."""
-    return _epi.strict_trans(text, normpunc, ligatures)
-
-def general_trans(text, filter_func, normpunc=False, ligatures=False):
-    """General transliteration with filter function."""
-    return _epi.general_trans(text, filter_func, normpunc, ligatures)
diff --git a/epitran/adapters/spa_transliterate.py b/epitran/adapters/spa_transliterate.py
deleted file mode 100644
index ccd4716..0000000
--- a/epitran/adapters/spa_transliterate.py
+++ /dev/null
@@ -1,12 +0,0 @@
-"""Adapter: Spanish (spa-Latn) transliteration for Regrets."""
-from epitran.simple import SimpleEpitran
-
-_epi = SimpleEpitran('spa-Latn', preproc=True, postproc=True, ligatures=False)
-
-def transliterate(text, normpunc=False, ligatures=False):
-    """Transliterate Spanish text to IPA."""
-    return _epi.transliterate(text, normpunc, ligatures)
-
-def general_trans(text, filter_func, normpunc=False, ligatures=False):
-    """General transliteration with filter function."""
-    return _epi.general_trans(text, filter_func, normpunc, ligatures)
diff --git a/epitran/adapters/spa_word_to_tuples.py b/epitran/adapters/spa_word_to_tuples.py
deleted file mode 100644
index a8420e1..0000000
--- a/epitran/adapters/spa_word_to_tuples.py
+++ /dev/null
@@ -1,8 +0,0 @@
-"""Adapter: Spanish word_to_tuples for Regrets."""
-from epitran.simple import SimpleEpitran
-
-_epi = SimpleEpitran('spa-Latn', preproc=True, postproc=True, ligatures=False)
-
-def word_to_tuples(text, normpunc=False):
-    """Word to tuples — detailed segment analysis."""
-    return _epi.word_to_tuples(text, normpunc)
diff --git a/epitran/adapters/strip_diacritics_adapter.py b/epitran/adapters/strip_diacritics_adapter.py
deleted file mode 100644
index de554c3..0000000
--- a/epitran/adapters/strip_diacritics_adapter.py
+++ /dev/null
@@ -1,8 +0,0 @@
-"""Adapter: StripDiacritics for spa-Latn for Regrets."""
-from epitran.stripdiacritics import StripDiacritics
-
-_sd = StripDiacritics('spa-Latn')
-
-def process(word):
-    """Strip specified diacritics from text."""
-    return _sd.process(word)
diff --git a/epitran/adapters/xsampa_adapter.py b/epitran/adapters/xsampa_adapter.py
deleted file mode 100644
index 26e837c..0000000
--- a/epitran/adapters/xsampa_adapter.py
+++ /dev/null
@@ -1,12 +0,0 @@
-"""Adapter: XSampa for Regrets."""
-from epitran.xsampa import XSampa
-
-_xs = XSampa()
-
-def ipa2xs(ipa):
-    """Convert IPA string to X-SAMPA."""
-    return _xs.ipa2xs(ipa)
-
-def longest_prefix(s):
-    """Find longest matching prefix in trie."""
-    return _xs.longest_prefix(s)