Using RQL filter documents by condition on nested array in RavenDB 4.0+ - ravendb

Question

In RavenDB 4.0+ for a given Sample Northwind database (which is also available at http://live-test.ravendb.net/), what RQL queries one may use to:
Get Orders in which at least one of the Lines has Discount == 0?
Get Orders in which all the Lines have Discount != 0?
Get Orders in which at least one of the Lines has Discount != 0?
Get Orders in which all the Lines have Discount == 0?
Here's a sample document structure:
{
"Company": "companies/85-A",
"Employee": "employees/5-A",
"Freight": 32.38,
"Lines": [
{
"Discount": 0,
"PricePerUnit": 14,
"Product": "products/11-A",
"ProductName": "Queso Cabrales",
"Quantity": 12
},
{
"Discount": 0,
"PricePerUnit": 9.8,
"Product": "products/42-A",
"ProductName": "Singaporean Hokkien Fried Mee",
"Quantity": 10
},
{
"Discount": 0,
"PricePerUnit": 34.8,
"Product": "products/72-A",
"ProductName": "Mozzarella di Giovanni",
"Quantity": 5
}
],
"OrderedAt": "1996-07-04T00:00:00.0000000",
"RequireAt": "1996-08-01T00:00:00.0000000",
"ShipTo": {
"City": "Reims",
"Country": "France",
"Line1": "59 rue de l'Abbaye",
"Line2": null,
"Location": {
"Latitude": 49.25595819999999,
"Longitude": 4.1547448
},
"PostalCode": "51100",
"Region": null
},
"ShipVia": "shippers/3-A",
"ShippedAt": "1996-07-16T00:00:00.0000000",
"#metadata": {
"#collection": "Orders",
"#flags": "HasRevisions",
"#id": "orders/1-A",
"#last-modified": "2018-07-27T12:11:53.0447651Z",
"#change-vector": "A:417-EKrWjfz5kESi6lp7Nf442Q",
"#index-score": 1
}
}
I managed to find out some answers only for 1 and 2:
Get Orders in which at least one of the Lines has Discount == 0?
from Orders where Lines[].Discount == 0
from Orders where Lines[].Discount IN (0)
from Orders where Lines[].Discount ALL IN (0)
Get Orders in which all the Lines have Discount != 0?
from Orders where Lines[].Discount != 0