About three endogeneous variables and instrumental variables

[XICHEN]

I am a Stata user in school, I got a problem of writing code for my equation which is in the following format
Y= a + bX1 +cX2+c
X1= d+ eY +fX2 +g
X2=h+ iY+ jX1 + k
As I haven’t found answers from stata help, so could anyone please give me a hand?

[Steve Samuels]

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