power calculation in SAS

proc power; 
  twosamplefreq test=pchi 
  groupproportions = (.5034  .6459) 
  power = .
  groupns = ( 1494 373)
  alpha = 0.00005;
run;

proc power; 
      twosamplesurvival test=logrank 
         gexphs = 0.6733 | 0.4155
         accrualtime = .00001
   follouptime = 1 
         groupns = 200 | 200 
   grouplossexphazards = (0 0)
         power = .; 
proc power; 
      twosamplesurvival test=logrank 
         curve("Control")   = (1):(.45) 
         curve("Treatment") = (1):(.66) 
         groupsurvival = "Control" | "Treatment" 
   GROUPLOSSEXPHAZARDS = (.2231 .2231)
   /*grouplossexphazards = (0,0)*/
         accrualtime = .00001
         follouptime = 1 
         groupns = 120 | 120 
         power = .; 
run;

proc power; 
      twosamplesurvival test=logrank 
         curve("Control")   = (1):(.51) 
         curve("Treatment") = (1):(.66) 
         groupsurvival = "Control" | "Treatment" 
   GROUPLOSSEXPHAZARDS = (.2231 .2231)
   /*grouplossexphazards = (0,0)*/
         accrualtime = .00001
         follouptime = 1 
         groupns = 100 | 100 
         power = .; 
run;

proc power; 
      twosamplesurvival test=logrank 
         curve("Control")   = (1):(.45) 
         curve("Treatment") = (1):(.70) 
         groupsurvival = "Control" | "Treatment" 
   GROUPLOSSEXPHAZARDS = (.2231 .2231)
   /*grouplossexphazards = (0,0)*/
         accrualtime = .00001
         follouptime = 1 
         groupns = 200 | 200 
         power = .; 
run;
 

how to get rid of emac's automatic switching of _ into ->

Solution by Paul R. (thanks!)

M-x
set-variable 
ess-S-assign 
"-"  

That's it.