In this question, each of the letters I, R, S and T represents a different transformation.

We can do one transformation followed by another. For example, R S means ``do R, then S''.

We can also undo transformations. For example, R-1 means ``do the inverse (opposite) of R''.

Here are the effects of some transformations on a shape. Can you describe the transformations
I, R, S and T?

Transformation S
Transformation Sinv R
Transformation RT
Transformation RI

What single transformation has the same effect as R S T I R-1S-1T-1I-1?

This problem is the first of three related problems.
The follow-up problems are Combining Transformations and Simplifying Transformations .