for ff[1] in factors, ff[2] in factors, ff[3] in factors, ff[4] in factors,
    ff[5] in factors, ff[6] in factors, ff[7] in factors,
    ff[8] in factors, ff[9] in factors

To simplify the above, I tried the following but it didn't work:

for ff[1:9] in factors

Is there a similar simple way to do?

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