I have a list with different vector length:
 [[1]]
 X1  X2 
"N" "N" 
[[2]]
 X1  X2 
"N" "C" 
[[3]]
 X1  X2 
"S" "S" 
[[4]]
 X1  X2  X3 
"S" "S" "U" 
[[5]]
NULL
[[6]]
 X1  X2 
"S" "N" 
[[7]]
 X1  X2  X3 
"S" "S" "S" 
[[8]]
 X1  X2 
"S" "N" 
[[9]]
 X1  X2  X3  X4  X5  X6 
"F" "S" "S" "S" "N" "C" 
What I am trying to accomplish is to cbind equal length vectors together, to be like this, for 3 length vectors:
   [,1] [,2] 
X1 "S"  "S"  
X2 "S"  "S"  
X3 "U"  "S"
Same goes for other length vectors, such as 2:
 [,1] [,2] [,3] [,4] [,5]
X1 "N"  "N"  "S"  "S"  "S"
X2 "N"  "C"  "S"  "N"  "N"
Thank you in advance.
