How to change the order

[fu gang]

* Example generated by -dataex-. For more info, type help dataex
clear
input str20 x double y
"a"   1
"a" 1.1
"a" 1.2
"a" 1.3
"a" 1.4
"b" 1.5
"b" 1.6
"b" 1.7
"c" 1.8
"c" 1.9
end

tab y x

| x
y | a b c | Total
-----------+---------------------------------+----------
1 | 1 0 0 | 1
1.1 | 1 0 0 | 1
1.2 | 1 0 0 | 1
1.3 | 1 0 0 | 1
1.4 | 1 0 0 | 1
1.5 | 0 1 0 | 1
1.6 | 0 1 0 | 1
1.7 | 0 1 0 | 1
1.8 | 0 0 1 | 1
1.9 | 0 0 1 | 1
-----------+---------------------------------+----------
Total | 5 3 2 | 10




How to change the order of x in the tab coｍｍand？ because the display needs, you need to change the order of x and y from a　b　c to c　b　a or c a　b in the tab x command

the target result is as follows:

| x
y | c b a | Total
-----------+---------------------------------+----------
1 | 0 0 1 | 1
1.1 | 0 0 1 | 1
1.2 | 0 0 1 | 1
1.3 | 0 0 1 | 1
1.4 | 0 0 1 | 1
1.5 | 0 1 0 | 1
1.6 | 0 1 0 | 1
1.7 | 0 1 0 | 1
1.8 | 1 0 0 | 1
1.9 | 1 0 0| 1
-----------+---------------------------------+----------
Total | 5 3 2 | 10




levelsof x
`"a"' `"b"' `"c"'

but it needs the order
`"c"' `"b"' `"a"'

How to get the result of getting the corresponding target order in the above two commands（tab twoway & levelsof)

Thank you very much!