 
 `boost`  
 `back ` 
`boost`  
 `back`  
 `boost`  
 `back`  
 `boost`  
 `back` 
`boost`  
 `back`'
     
 `boost`  
 `back ` 
`boost`  
 `back`  
 `boost`  
 `back`  
 `boost`  
 `back` 
`boost`  
 `back`'
     
  
  *boostBACK*
*boostBACK*
 
  
  *boostBACK*
*boostBACK*
 
  
  *boostBACK*
*boostBACK*
 .
.
     
  *boostBACK*
*boostBACK*
 .
.
     
  *boostBACK*
*boostBACK*
 ..
..
     
  *boostBACK*
*boostBACK*
 ..
..