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Which of the following is (are) valid $\text{FORTRAN} 77$ statement(s)?

1. $\mathrm{DO} 131=1$
2. $\mathrm{A}=\mathrm{DIM}^{* * 7} 7$
3. $\text{READ}$ $=15.0$
4. $\text{GOTO}$ $3=10$