Saturday Mac riddles 193

Here are this weekend’s riddles to entertain you through family time, shopping and recreation.

1: Pianist’s notes for typing and shortcuts.

2: Stiff card on a hardback to contain what’s copied.

3: Manages apps with assertions down the side of a car.

To help you cross-check your solutions, there’s a common factor between them.

I’ll post my solutions first thing on Monday morning.

Please don’t post your solutions as comments here: it spoils it for others.