"Consonance" primarily focuses on the repetition of which type of sound?

♦ Consonance:
- Repetition of consonants without similar vowels for two or more times at the end of accented syllables.

Example- in “shock”, “luck” and “pick”; “ck' has been repeated but the accompanying vowels are different.
“Rough winds do shake the darling buds of May.''
(Shakespeare: “Sonnet XVIII”)

Source: An ABC of English Literature - Dr M Mofizar Rahman