Chapter 4 - Congruent Triangles - 4-5 Isosceles and Equilateral Triangles - Practice and Problem-Solving Exercises - Page 256: 42

We can see that this pattern is the days of the week represented by their first letters. The next two terms are $S$ and $S$.

We can see that this pattern is the days of the week represented by their first letters: Monday ($M$), Tuesday ($T$), Wednesday ($W$), Thursday ($T$), Friday ($F$). The next two days of the week are Saturday and Sunday. We can represent Saturday with $S$ and Sunday with $S$.