1..=3: 11 12 13 (len 3)
0<..<4: 11 12 13 (len 3)
..=2: 10 11 12 (len 3)
<..3: 11 12 (len 2)
2<..: 13 14 15 (len 3)
..: 10 11 12 13 14 15 (len 6)
x-1..=x+1: 12 13 14 (len 3)
str 1..=3: bcd
str 0<..<4: bcd