How can I prevent to some specific numberS to be consecutive in a random matrix in MATLAB?

I want to create a random sequence for numbers howver some numbers should not come before or after some others.

For example after the numbers of 1,6,11,16; the some others like 1,2,3,4,5 should not come. If they came consequently ı want to shuffle the matix e until the condition is fulfilled. The same rules must be applies for more 3 groups of numbers: 2,7,12,17=>6,7,8,9,10 should not come 3,8,13,18=>11,12,13,14,15 should not come 4,9,14,19=>16,17,18,19,20 should not come

    for x=1:1000
        i=1:71
        a = [1 5 7 10 13 15 19 20]%congruent and neutral items multiplied by 6
        b = Shuffle(repmat(a,1,6))
        c = [2 3 4 6 8 9 11 12  14 16 17 18 ]%incongruent items multiplied by 2
        d =  Shuffle(repmat(c,1,2))
        e = [b d]%together
        if  (e(i)==1|6|11|16)&(e(i+1)~=1|2|3|4|5)
            break
        else
            Shuffle(e)
        end
            x = x + 1
        if x==1000
           break
        end
        end

[the cyclist]

You gave a few examples, but I still do not understand the general rule.