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Omni-MATH / Let S be a set, |S|=35. A set F of mappings from S to itself is called to be satisfying property P(k), if for any x,y∈S, there exist f₁,⋯,f_(k)∈F (not necessarily different), such …

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Let SS be a set, |S|=35|S|=35. A set FF of mappings from SS to itself is called to be satisfying property P(k)P(k), if for any x,ySx,y\in S, there exist f1,,fkFf_1, \cdots, f_k \in F (not necessarily different), such that fk(fk1((f1(x))))=fk(fk1((f1(y))))f_k(f_{k-1}(\cdots (f_1(x))))=f_k(f_{k-1}(\cdots (f_1(y)))). Find the least positive integer mm, such that if FF satisfies property P(2019)P(2019), then it also satisfies property P(m)P(m).
Plain-text mathematical notation (without MathML)
Let S be a set, |S|=35. A set F of mappings from S to itself is called to be satisfying property P(k), if for any x,y∈S, there exist f₁,⋯,f_(k)∈F (not necessarily different), such that f_(k)(f_(k−1)(⋯(f₁(x))))=f_(k)(f_(k−1)(⋯(f₁(y)))).
Find the least positive integer m, such that if F satisfies property P(2019), then it also satisfies property P(m).
Original LaTeX notation
Let $S$ be a set, $|S|=35$. A set $F$ of mappings from $S$ to itself is called to be satisfying property $P(k)$, if for any $x,y\in S$, there exist $f_1, \cdots, f_k \in F$ (not necessarily different), such that $f_k(f_{k-1}(\cdots (f_1(x))))=f_k(f_{k-1}(\cdots (f_1(y))))$.
Find the least positive integer $m$, such that if $F$ satisfies property $P(2019)$, then it also satisfies property $P(m)$.

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