[R] Transforming list to data frame with corresponding columns

[LCOG1]

Hi all, 
   Consider the following.


a<-list(c("MHsub","MHsub","SFD","Duplex"))
b<-list(c("MHsub","MHsub","SFD"))
c<-list(c("MHpark","SFD","SFD"))
d<-list(c("MultiFam","MultiFam","MultiFam","Duplex"))

all<-list(a,b,c,d)
names(all)<-c("5","6","7","8")
all2<-list()
for(i in 1:length(all)){
all2[[i]]<-table(unlist(all[i]))
}
names(all2)<-names(all)

What i want to do is to put each of the elements of the list into a data
frame where the element represents a row and each vector is accounted for,
for all types within the entire list.  So where there isnt a particular
vector a 0 is noted so that the final product looks like this:


	SFD	Mhsub	Duplex	MultiFam
5	1	   1	            1               0
6	1	   1	            0	            0
7	1	   1	            0	            0
8	0	   0	            1	            1 

Thanks for the insights.  
 
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