Maximally even {15/14,16/15,21/20,25/24} scales

There turn out to be two of these, with a maximum of five types of
intervals per interval type. The first appears to be more interesting.

! even12a.scl
first maximally even {15/14,16/15,21/20,25/24} scale
12
!
21/20
35/32
7/6
5/4
21/16
45/32
3/2
25/16
105/64
7/4
15/8
2

! even12b.scl
second maximally even {15/14,16/15,21/20,25/24} scale
12
!
21/20
28/25
6/5
5/4
4/3
7/5
3/2
63/40
42/25
7/4
15/8
2