Consonants, including clusters, that occur after a stressed syllable can occur in multiple distinctive length types, or quantities. These are conventionally labelled quantity 1, 2 and 3 or Q1, Q2 and Q3 for short. The consonants of a word alternate in a process known as consonant gradation, where consonants appear in different quantities depending on the specific grammatical form. Normally, one of the possibilities is named the "strong grade", while the other is named "weak grade". The consonants of a weak grade are normally quantity 1 or 2, while the consonants of a strong grade are normally quantity 2 or 3.