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Here we will present a graphical software tool called Morph Moulder (MoMo) for teaching the formal foundations of a language with a denotation in a domain of relational typed feature structures as used in Head-Driven Phrase Structure Grammar. With MoMo, students learn the properties of totally well-typed, sort resolved relational feature structures, the use of formal languages to describe typed feature structures and the notions of constraint satisfaction and models of grammars written in a formal language. MoMo was realized and conceived within the context of a set of courses in the format of web-based training, that focuses on the concept of typed feature structures in a curriculum in grammar formalisms and parsing. The formal language of MoMo amends the constraint language of TRALE (an implementation platform for HPSG grammars based on ALE) to accommodate the expressive power of HPSG.