Tips for golfing in MATL MATL is a golfing language created by Luis Mendo. MATL has proven to be highly competitive, often beating submissions in other golfing languages such as Pyth, CJam and Jelly.

What are some useful tips for golfing in MATL? (As always, one tip per answer, please!) 


For the record, MATL can be tested online here.
Documentation can be found on Github
Know the predefined literals
Although some of them keep information when copied to the clipboard, they all have a predefined value.

F, pushes 0 (actually False)
T, pushes 1 (actually True)
H, pushes 2 (predefined clipboard value)
I, pushes 3 (predefined clipboard value)
K, pushes 4 (predefined clipboard value)
J, pushes 0 + 1j (predefined clipboard value)

Not sure if I have covered all predefined values though.