Which four sections formed the basic Mannheim symphony orchestra?

The Mannheim school, led by composers such as Johann Stamitz, was instrumental in establishing the foundation of the modern symphony orchestra. This ensemble was organized into four primary sections:1

• Woodwinds: Typically consisting of flutes, oboes, and bassoons.1
• Brass: Comprising horns and trumpets.1
• Percussion: Featuring two timpani.1
• Strings: Including first and second violins, violas, cellos, and double basses.1

During this period, clarinets were also adopted into the orchestra, while older instruments like the harpsichord were gradually phased out.1