The PCB used for the Mama Shield can also be assembled as a card with an Arduino socket, thus we have "Mama Shield Card". This way you can stack about three Arduino shields on one Arduino.
The Mama Shield Card also has a switchboard so you can easily reconfigure the pin mapping.
the switchboard can be used much like an old-style switchboard was used by a telephone operator to connect a call.
There is also a row of jumper pins with the jumpers in case you want to keep everything the same.
Cuttable solder jumpers pins: