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Convert the exponential equations into logarithmic form:

(a) `5^4 = 625` is equivalent to `log_5 C=D`.

`C=` and `D=`

(b) `49 = 7^2` is equivalent to `log_7 E = F`.

`E=` and `F=`

(c) `10^3 = 1000` is equivalent to `log_10 G = H`.

`G=` and `H=`

(d) `0.0001 = 10^-4` is equivalent to `log_10 J = K`.

`J=` and `K=`

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