-import IPv4Address (IPv4Address(..), most_sig_bit_different)
-import Maskable (Maskable(..))
-import Maskbits (Maskbits(..))
-import Octet (Octet(..))
+import IPv4Address (
+ IPv4Address( IPv4Address, octet1, octet2, octet3, octet4 ),
+ most_sig_bit_different )
+import Maskable (Maskable(apply_mask))
+import Maskbits ( Maskbits(Zero) )
+import Octet (Octet())