// OR
db.books.find( { $or: [{year: {$lte: 2008}}, {year: {$eq: 2016}}]} )

// AND
db.books.find( { $and: [{year: {$eq: 2008}}, {category: {$eq: "Fiction"}}]} )

// NOT
db.books.find( {$not: {year: {$eq: 2016} }})

// NOR
db.books.find( { $nor: [{year: {$lte: 2008}}, {year: {$eq: 2016}}]} )