This question is based on Literary Principles.
'BEHOLD her, single in the field,
Yon solitary Highland Lass!
Reaping and singing by herself;
Stop here, or gently pass!
Alone she cuts and blinds the grain,
And sings a melancholy strain;
O listen! for the Vale profound
Is overflowing with the sound.'
The rhyming scheme in the first stanza of 'The Solitary Reaper' above is