Use the Venn diagram technique for all problems. Conifers are trees with no leaves. A ship with two masts may be a sloop. Some cities are cloudier than Seattle. Translate the following arguments into categorical form.
Most birds can fly.
But bats can fly too. So, a few bats are birds. The V-22 Osprey has wings, which no helicopter has. So the V-22 Osprey is not a helicopter. Monday Feb 19.