Transponder question
Frome Wikipedia:
"Squawk codes are four-digit octal numbers; the dials on a transponder read from zero to seven inclusive. Thus the lowest possible squawk is 0000 and the highest is 7777. There are 4096 permutations of these four digit codes, which is why they are often called "4096 code transponders."
Wouldn't there be 7777 permutations or possible codes from a transponder. I am assuming that permutation means code.