Given n{n}n strings s1,s2,⋯ ,sns_1, s_2, cdots, s_ns1,s2,⋯,sn. Now define f(s,t){f(s, t)}f(s,t) as the maximum i{i}i that satisfy s1…i=t∣t∣−i+1…∣t∣s_{1dots i} = t_{|t|-i+1 dots |t|}s1…i=t∣t∣−i+1…∣t∣, and if such i{i}i doesn't exist, f(s,t)=0{f(s, t) = 0}f(s,t)=0. The Problem is to calculate: ∑i=1n∑j=1nf(si,sj)2(mod998244353)sum_{i=1}^{n}sum_{j=1}^{n}f(s_i, s_j)^2 pmod{998244353}∑i=1n∑j=1nf(si,sj)2(mod998244353)
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