First set
$FIRST Collection $
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$ s\rightarrow a ..., \ \
A \ \ \in first (S) \ \
$
------------------------------------------------------------------------
$S \rightarrow \epsilon, \ \
\epsilon \in First (S) \ \
$
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$S \rightarrow y_{1}y_{2}y_{3} ... y_{n},\\
First (Y_{1})/\epsilon \subset first (S) \ \
If \ \ \epsilon \in first (y_{1}) \ \
First (y_{2})/\epsilon \subset first (S) \ \
\\IF \ \epsilon \in First (Y_{1}), \epsilon \ In First (y_{2}) \ \
First (y{3})/\epsilon \subset first (S) \ \
If \ \ \epsilon \in first (Y_{1}), \epsilon \ In First (y_{2}), \epsilon \in First (y_{3}) \ \
First (y_{4})/\epsilon \subset first (S) \ \
......... etc. \
If \ \ \epsilon \in first (Y_{1}), \epsilon \ In First (y_{2}), \epsilon \in First (y_{3}),... \epsilon \in First (y_{n}) \ \
\epsilon \in First (S) \ \
\\
\\
$
Follow set
$FOLLOW Collection $
------------------------------------------------------------------------
$A->xb\\
Follow (A) \subset Follow (B) \ \
$
------------------------------------------------------------------------
$A->xby_{1}y_{2} ... y_{n}\\
First (Y_{1}) \subset follow (B) \ \
If \ \ \epsilon \in first (y_{1}) \ \
First (y_{2}) \subset follow (B) \ \
if (\ \epsilon \in First (Y_{1}), \epsilon \in First (y_{2}) \ \
First (y_{3}) \subset follow (B) \ \
..... etc. \
If \ \ \epsilon \in first (Y_{1}), \epsilon \ In First (y_{2}), \epsilon \in First (y_{3}),... \epsilon \in First (y_{n}) \ \
\epsilon \in First (S) \ \
Follow (A) \subset Follow (B) \ \
$
The method of first set and follow set