Musical Cadences

In music, cadences act as punctuation in musical phrases, and help to mark the end of phrases. Cadences are the two chords at the end of a phrase. The different cadences are as follows:

• V followed by I is a Perfect Cadence
• IV followed by I is a Plagal Cadence
• V followed by Any chord other than I is an Interrupted Cadence
• Any chord followed by V is an Imperfect Cadence

Create a function where given a chord progression as a list, return the type of cadence the phrase ends on.

Examples

find_cadence(["I", "IV", "V"]) ➞ "imperfect"

find_cadence(["ii", "V", "I"]) ➞ "perfect"

find_cadence(["I", "IV", "I", "V", "vi"]) ➞ "interrupted"

Notes

• Return strings all in lowercase.
• Only focus on the last two chords of a progression.
• Return "no cadence" if none of the criteria match up.
• I is a capital i, not a lowercase L.