##### COMMAND TO SELECT THE DATABASE #####
> use warehouse

##### COMMAND 1 #####
> db.garden.find( { $and: [ {"attrs": "red"}, {"attrs": "round"} ] } ).pretty()

##### COMMAND 2 #####
> db.garden.find( { attrs: { $not : /^red.*/ } } ).pretty()

##### COMMAND 3 #####
> db.garden.find( { $nor: [ {"attrs": "red"}, {"attrs": "green"} ] } ).pretty()

##### COMMAND 4 #####
> db.garden.find( { $or: [ {"attrs": "purple"}, {"attrs": "green"}, {"attrs": "blue"} ] } ).pretty()