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{
"substitutions": {
"/s/→/θ/": "Lisp - Use tongue tip placement behind upper teeth. Practice /s/ in isolation, then in words. Use mirror feedback to ensure tongue is not protruding.",
"/s/→/ʃ/": "Sibilant confusion - Practice /s/ vs /sh/ distinction. Focus on tongue position: /s/ has tongue tip up, /sh/ has tongue body back.",
"/s/→/z/": "Voicing error - Practice voiceless /s/ vs voiced /z/. Place hand on throat to feel vibration difference.",
"/r/→/w/": "Rhotacism - Practice tongue position: curl tongue back, avoid lip rounding. Start with /r/ in isolation, then CV syllables (ra, re, ri, ro, ru).",
"/r/→/l/": "Rhotacism - Focus on tongue tip position vs. tongue body placement. /r/ uses tongue body, /l/ uses tongue tip.",
"/r/→/ɹ/": "Rhotacism variant - Practice standard /r/ production with proper tongue curl.",
"/l/→/w/": "Liquid substitution - Practice lateral tongue placement with tongue tip up to alveolar ridge.",
"/l/→/j/": "Liquid substitution - Focus on tongue tip contact for /l/ vs. tongue body for /j/.",
"/k/→/t/": "Velar to alveolar substitution - Practice back tongue placement for /k/. Use mirror to see tongue position.",
"/k/→/p/": "Velar to bilabial substitution - Practice velar placement: tongue back, soft palate contact.",
"/g/→/d/": "Velar to alveolar substitution - Practice voiced velar /g/ with tongue back position.",
"/g/→/b/": "Velar to bilabial substitution - Practice velar placement for /g/.",
"/θ/→/f/": "Th-fronting - Practice tongue tip placement between teeth for /θ/. Use mirror to ensure correct position.",
"/θ/→/s/": "Th-fronting - Practice interdental placement for /θ/ vs. alveolar /s/.",
"/ð/→/v/": "Voiced th-fronting - Practice interdental placement for /ð/ vs. labiodental /v/.",
"/ð/→/z/": "Voiced th-fronting - Practice interdental /ð/ vs. alveolar /z/.",
"/ʃ/→/s/": "Sh-sound confusion - Practice /sh/ with tongue body back vs. /s/ with tongue tip up.",
"/ʃ/→/tʃ/": "Fricative to affricate - Practice sustained /sh/ vs. stop-release /ch/.",
"/tʃ/→/ʃ/": "Affricate to fricative - Practice stop component of /ch/ before fricative release.",
"/tʃ/→/ts/": "Affricate substitution - Practice /ch/ with proper tongue placement and air release.",
"generic": "Substitution error for {phoneme}. Practice correct articulator placement with mirror feedback. Start in isolation, then syllables, then words."
},
"omissions": {
"/r/": "Practice /r/ in isolation, then in CV syllables (ra, re, ri, ro, ru). Focus on tongue curl and lip position. Use visual cues and mirror feedback.",
"/l/": "Lateral tongue placement - practice with tongue tip up to alveolar ridge. Start with /l/ in isolation, then blend into words.",
"/s/": "Practice /s/ with tongue tip placement, use mirror to check position. Start in isolation, then fricative-only words (sss, see, say).",
"/k/": "Practice velar /k/ with tongue back position. Use mirror to see tongue placement. Start with /k/ in isolation.",
"/g/": "Practice voiced velar /g/ with tongue back. Start in isolation, then CV syllables.",
"/t/": "Practice alveolar /t/ with tongue tip contact. Use mirror feedback for placement.",
"/d/": "Practice voiced alveolar /d/ with tongue tip contact.",
"/p/": "Practice bilabial /p/ with lip closure. Use mirror to ensure proper closure.",
"/b/": "Practice voiced bilabial /b/ with lip closure.",
"/f/": "Practice labiodental /f/ with lower lip to upper teeth contact.",
"/v/": "Practice voiced labiodental /v/ with lip-teeth contact.",
"/θ/": "Practice interdental /θ/ with tongue tip between teeth.",
"/ð/": "Practice voiced interdental /ð/ with tongue tip between teeth.",
"/ʃ/": "Practice /sh/ with tongue body back and lip rounding.",
"/tʃ/": "Practice /ch/ with stop then fricative release.",
"/dʒ/": "Practice /j/ (as in judge) with stop then fricative release.",
"generic": "Omission error for {phoneme}. Say the sound separately first, then blend into syllables, then words. Use visual cues and mirror feedback."
},
"distortions": {
"/s/": "Sibilant clarity - use mirror feedback, ensure tongue tip is up and air stream is central. Practice sustained /s/ sound.",
"/z/": "Voiced sibilant clarity - practice with voicing, ensure proper tongue placement.",
"/ʃ/": "Fricative voicing exercise - practice /sh/ vs /s/ distinction. Focus on tongue body position.",
"/tʃ/": "Affricate clarity - practice stop component then fricative release. Ensure proper timing.",
"/r/": "Rhotacism - practice tongue position and lip rounding control. Use mirror to see tongue curl.",
"/l/": "Lateral clarity - ensure tongue tip is up and air flows over sides of tongue.",
"/θ/": "Interdental clarity - practice with tongue tip between teeth, ensure air stream is correct.",
"/ð/": "Voiced interdental clarity - practice with voicing and proper tongue placement.",
"/k/": "Velar stop clarity - practice with proper tongue back placement and release.",
"/g/": "Voiced velar stop clarity - practice with voicing and tongue placement.",
"/t/": "Alveolar stop clarity - practice with tongue tip contact and clean release.",
"/d/": "Voiced alveolar stop clarity - practice with voicing and proper contact.",
"generic": "Distortion error for {phoneme}. Use mirror feedback and watch articulator position carefully. Practice in isolation first, then in words."
}
}
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