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[P]     error . . . . . . . . . . . . . . . . . . . . . . . .  Return code 900
        no room to add more variables
        Stata just attempted to exceed the maximum number of variables
        allowed.  If you are using Stata/SE or Stata/MP, you can reset
        this maximum number; see help memory.  For Stata/BE, the maximum
        number is fixed at 2,048.
请问大家有什么解决办法吗