The captain ordered that the guards unshackle and release the prisoner, as he had served his sentence.

The timorous cowslips, one by one, / Trembling, chilly, atiptoe stand / On little hillocks and knolls alone; […]

The penis should be fully erect before commencing copulation.

Also it is advisable to distinguish this ( ˘ ˘ ) — ˘ ˘ — rhythm, where the princeps was probably shorter in duration than the biceps (as in the dactylic hexameter), from true (marching) anapaests, in which they were equal.