Pitman 2000 ( 1975 -- present ) introduced some simplifications .
Pitman 2000 ( 1975 -- present ) drastically reduced the list of abbreviations to reduce the memory load , officially reduced to a list of 144 short forms .
Pitman 2000 ( 1975 -- present ) introduced some simplifications and drastically reduced the list of abbreviations to reduce the memory load , officially reduced to a list of 144 short forms .