books operas based on plays
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# Works based on operas
# operas based on literature
# Operas based on novels
# Operas based on works
# Plays adapted from operas
# Plays based on works
# Works based on plays
# Novels based on plays
# Plays based on movies
# Plays based on novels
# operas in italian
# operas in french
# Operas in Arabic
# operas in english
# German-language operas
# Operas in Turkish
# Danish language operas
# Chinese operas
# Works turned into operas
# Novels turned into operas
