[see also: outnumber, surpass]
The degree of $F$ exceeds that of $G$ by at least 4.
The support of $F$ has diameter not exceeding $l$.
It is intuitively clear that the amount by which $S_n$ exceeds zero should follow the exponential distribution.
Define $a_k$ to be the probability that exactly $k$ out of the $2n$ values $X_i$ exceed $T$, conditional on $X_0>T$.
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