<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def alien_filter(name, location, size, unsize):
 """Fix to avoid packages include in slackbuilds folder """

    (fname, flocation, fsize, funsize) = ([] for i in range(4))
    for n, l, s, u in zip(name, location, size, unsize):
        if "slackbuilds" != l:
            fname.append(n)
            flocation.append(l)
            fsize.append(s)
            funsize.append(u)
    return [fname, flocation, fsize, funsize]