### Problem 1
\b[RGP]\w*\b

### Problem 2
\b[A-Z]\w*\b

### Problem 3
\b\w*ss\w*\b

### Problem 4
\b\w\w\w\w\b

### Problem 5
\b\w+ \d+\b

### Problem 6
, \w+ \w+,

### Problem 7
\b(the|you) \w+ \b+

### Problem 8
\b([A-Z]\w*)int \1\b

### Problem (
^(\b\w+\b \b\w+\b ?)+$)

### Problem 10
^([A-Z]\d)+$