IQSort.py

def iqsort(arr):
    if len(arr) == 1:
            yield arr
    else:
            for i in xrange(len(arr)):
                    for j in arr:
                            if arr[i] - j > 8:
                                    break
                    else:
                            s = iqsort(arr[:i]+arr[i+1:])
                            for k in s:
                                    yield [arr[i]] + k

print len([i for i in iqsort([20,25,30,35,40,45,50,55,60,64,65,70,75,80,85,90,95,100,105,110])])