# by the authority of GOD   author: manhar singh sachdev #

import os,sys
from io import BytesIO,IOBase
from bisect import bisect_right as br
from types import GeneratorType

def bootstrap(f,stack=[]):
    def wrappedfunc(*args,**kwargs):
        if stack:
            return f(*args,**kwargs)
        else:
            to = f(*args,**kwargs)
            while True:
                if type(to) is GeneratorType:
                    stack.append(to)
                    to = next(to)
                else:
                    if len(stack):
                        stack.pop()
                    if not stack:
                        break
                    to = stack[-1].send(to)
            return to

    return wrappedfunc

mod = 10**9+7
fac = [1]
for ii in range(1,10**5+1):
    fac.append((fac[-1]*ii)%mod)
fac_in = [pow(fac[-1],mod-2,mod)]
for ii in range(10**5,0,-1):
    fac_in.append((fac_in[-1]*ii)%mod)
fac_in.reverse()

def comb(a,b):
    if a < b:
        return 0
    return (fac[a]*fac_in[a-b]*fac_in[b])%mod

@bootstrap
def find(l,r,val,inde):
    if l >= r:
        return 1
    x = inde[val][br(inde[val],r)-1]
    return (comb(r-l,x-l)*find(l,x-1,val,inde)*find(x+1,r,val+1,inde))%mod

def main():
    for case in range(1,int(input())+1):
        n = int(input())
        v = list(map(int,input().split()))
        inde = [[] for _ in range(n+1)]
        for ind,i in enumerate(v):
            inde[i].append(ind)
        if v[0] != 1:
            ans = 0
        else:
            for i in range(1,n):
                if v[i] > v[i-1]:
                    if v[i]-v[i-1] != 1:
                        ans = 0
                        break
            else:
                ans = find(0,n-1,1,inde)
        print'Case #{}: {}'.format(case,ans)

# Fast IO Region
BUFSIZE = 8192

class FastIO(IOBase):
    newlines = 0

    def __init__(self,file):
        self._fd = file.fileno()
        self.buffer = BytesIO()
        self.writable = "x" in file.mode or "r" not in file.mode
        self.write = self.buffer.write if self.writable else None

    def read(self):
        while True:
            b = os.read(self._fd,max(os.fstat(self._fd).st_size,BUFSIZE))
            if not b:
                break
            ptr = self.buffer.tell()
            self.buffer.seek(0,2),self.buffer.write(b),self.buffer.seek(ptr)
        self.newlines = 0
        return self.buffer.read()

    def readline(self):
        while self.newlines == 0:
            b = os.read(self._fd,max(os.fstat(self._fd).st_size,BUFSIZE))
            self.newlines = b.count(b"\n")+(not b)
            ptr = self.buffer.tell()
            self.buffer.seek(0,2),self.buffer.write(b),self.buffer.seek(ptr)
        self.newlines -= 1
        return self.buffer.readline()

    def flush(self):
        if self.writable:
            os.write(self._fd,self.buffer.getvalue())
            self.buffer.truncate(0),self.buffer.seek(0)

class IOWrapper(IOBase):
    def __init__(self,file):
        self.buffer = FastIO(file)
        self.flush = self.buffer.flush
        self.writable = self.buffer.writable
        self.write = lambda s:self.buffer.write(s.encode("ascii"))
        self.read = lambda:self.buffer.read().decode("ascii")
        self.readline = lambda:self.buffer.readline().decode("ascii")

sys.stdin,sys.stdout = IOWrapper(sys.stdin),IOWrapper(sys.stdout)
input = lambda:sys.stdin.readline().rstrip("\r\n")
if __name__ == "__main__":
    main()