Here is the list of all available LLLL.INs as of the scan done on March 27th, 2017.
The stats are:
CVCV Names Available: 8
VCVC Names Available: 7,807
AAAB Names Available: 39
ABBB Names Available: 25
ABAB Names Available: 14
AABB Names Available: 0
ABBA Names Available: 18
CHIP Names Available: 1,877
The trend graph is:
