Unemployment can be periodic.Logical formLearned from13 sentences. Appointments can be periodic.Logical formLearned from13 sentences. Queries can be periodic.Logical formLearned from13 sentences. A heating can be periodic.Logical formLearned from13 sentences. Economic downturns can be periodic.Logical formLearned from13 sentences. Slumps can be periodic.Logical formLearned from13 sentences. Instances can be periodic.Logical formLearned from13 sentences. Curfews can be periodic.Logical formLearned from13 sentences. A news can be periodic.Logical formLearned from13 sentences. A tuneup can be periodic.Logical formLearned from13 sentences. A crisis can be periodic.Logical formLearned from12 sentences. A sequence can be periodic.Logical formLearned from12 sentences. Stimuli can be periodic.Logical formLearned from12 sentences. (Health checks) can be periodic.Logical formLearned from12 sentences. Elements can be on a periodic table.Logical formLearned from12 sentences.