# 950 reference: answers

What each lesson changes, file by file, out of the solutions line. Use it when you are
stuck, not instead of being stuck.

```{toctree}
:maxdepth: 1

L020SticksOpMode
L030SpeedsOpMode
L040TankOpMode
L050BlocksOpMode
L060ShapingOpMode
L070ButtonsOpMode
L080ArcadeOpMode
L090MecanumOpMode
L110FollowerDriveTrain
L110FollowerOpMode
L120CompareLocalizersOpMode
L120EncoderLocalizer
L125Drive24OpMode
L130ForwardThenStrafeOpMode
L140FieldRelativeOpMode
L150RobotRelativeButtonOpMode
L160HeadingHoldOpMode
L170DriveToPoseOpMode
L180CombinedOpMode
L190SpeedDriveTrain
L190VelocityDriveOpMode
L195TicksDriveTrain
```