  
  [1m[4m[31m1. Introduction[0m
  
  The  aim  of  this package is to turn [1m GAP [0m more user-friendly, at least for
  semigroup  theorists.  It  requires the usage of external programs as is the
  case  of  [22m[32mgraphviz[0m  [DE+], a software for drawing graphs developed at AT & T
  Labs,  that can be obtained at [34mhttp://www.graphviz.org/[0m. It is used not only
  to  draw  right  Cayley  graphs  of  finite semigroups and Sch{\"u}zenberger
  graphs  of  finite inverse semigroups but also to visualize in the usual way
  the egg-box picture of a D-classe of a finite semigroup. [1m[46mImportant note[0m: The
  version  of  [22m[32mgraphviz[0m  to install should be greater or equal to 1.16. Tcl/Tk
  should   also  be  available  in  order  to  run  the  graphical  interfaces
  (XAutomaton and XSemigroup) used to specify automata and semigroups.
  
