The bracket erasure convention is an important convention in lexical phonology. It ensures that the morphological brackets introduced within a certain level are erased before entering the next level.
Here is an example of the bracket erasure convention. The brackets in pressurize are erased before it enters Level II.
[press] [-ure] [-ize]
[[[press] [-ure]] [-ize]]
[re-] [pressurize] (Bracket erasure)