function solution(user_id, banned_id) {
    var answer = 0
    
    const isBanned = (uid, bid) => {
        if(uid.length!==bid.length) return;
        for(let i=0; i<bid.length; i++){
            const b = bid[i];
            const u = uid[i];
            if(b==='*') continue;
            if(b!==u) return false;
        }
        return true;
    }
    
    const bannable = banned_id.map(bid => {
        const match = []
        user_id.forEach((uid, i) => isBanned(uid, bid) && match.push(i))
        return match;
    })
    
    const set = new Set()
    const dfs = (depth, nodes) => {
        const bannableUsers = bannable[depth]
        if(depth===banned_id.length){
            return set.add(nodes.join(''))
        }
        
        bannableUsers.forEach(bannableUser => {
            const newNodes = [...nodes]
            
            if(newNodes[bannableUser]) return
            
            newNodes[bannableUser] = 1;
            dfs(depth+1, newNodes);
        })
    }
    dfs(0, Array(user_id.length).fill(0))
    
    return set.size;
}