t1,t2,=map(int,input().split())
mod=998244353
class Comb:
    def __init__(self,sup,mod=998244353):
        self.sup=sup
        self.mod=mod
        self.inv=[1]
        self.fact=[1]
        for i in range(1,self.sup+1):
            self.fact.append((self.fact[-1]*i)%self.mod)
            self.inv.append((self.inv[-1]*pow(i,-1,mod))%self.mod)
    def C(self,n,r):
        assert(self.sup>n)
        if r>n :return 0
        return (self.fact[n]*self.inv[r]*self.inv[n-r])%self.mod
cm=Comb(200001)
for i in range(1,t1+1):
    if i==t1:
        print(-1)
        continue
    n,m=map(int,input().split())
    print(cm.C(m,n))