(10 ILCS 5/29C-5) (from Ch. 46, par. 29C-5; formerly Ch. 46, par. 811)
    Sec. 29C-5. Three Groups of Legislative Districts.
    The 59 legislative districts of this State are divided into 3 groups for the purpose of establishing the terms of Senators elected from each group. The districts in each group are distributed substantially equally over the State. The 3 groups shall consist of 20, 20 and 19 legislative districts, respectively, with each group having as its first district number, one of the numbers 1, 2 or 3, and shall be comprised of other district numbers, as follows:
    1      2      3
    4      5      6
    7      8      9
    10     11     12
    13     14     15
    16     17     18
    19     20     21
    22     23     24
    25     26     27
    28     29     30
    31     32     33
    34     35     36
    37     38     39
    40     41     42
    43     44     45
    46     47     48
    49     50     51
    52     53     54
    55     56     57
    58     59
(Source: P.A. 87-1052.)