How to combine variables with same values into one

Hi everyone,

Is there anybody known how to combine those variables that have totally the same values but different variable names into one ? Like below

Best regards
Chang

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Code:

* Example generated by -dataex-. To install: ssc install dataex
clear
input float(__a_br_new1111 __a_br_new1211 __a_br_new1311 __a_br_new1411 __a_br_new2111 __a_br_new2211 __a_br_new2311 __a_br_new2411 __a_br_new3111 __a_br_new3211)
1 1 1 1 1 1 1 1 1 1
0 1 1 1 1 1 1 1 1 1
0 0 1 1 1 1 1 1 1 1
0 0 0 1 0 0 0 1 0 0
end

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