Combining columns within a single file using awk

Question

I am trying to reformat a large file. The first 6 columns of each line are OK but the rest of the columns in the line need to be combined in increments of 2 with a "/" character in between.

Example file (showing only a few columns but have many more in actual file):

1       1       0       0       1       2       A       T       A       C

Into:

1       1       0       0       1       2       A/T     A/C

So far I have been trying awk and this is where I am at...

awk '{print $1,$2,$3,$4,$5; for(i=7; i < NF; i=i+2) print $i+"/"+$i+1}'  myfile.txt > mynewfile.txt

Answer 1

awk '{for(i=j=7; i < NF; i+=2) {$j = $i"/"$(i+1); j++} NF=j-1}1' input