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var modifiedList = function(nums, head) {
    let set = new Set(nums);

    
    const dummy = new ListNode(0);
    dummy.next = head;

    let curr = head;
    let prev = dummy;
    while(curr != null){

        if(set.has(curr.val)){
            prev.next = curr.next;
        }
        else{
            prev = curr;
        }
        curr = curr.next


    }

    return dummy.next;
}