{a for a in b}

{  c    for      c    in  d    if       e  if f  }

{g for g in h if i if j for k in l for m in o}

[a for a in b]

[  c    for      c    in  d    if       e  if f  ]

[g for g in h if i if j for k in l for m in o]

((p, q) for p, q in r)
