Workflow Conidtion

I am creating a condition that Expense claim should go to X state if employee cardre (field linked with employee doc) is Unit Head or Group Chief ortherewise to to Y state. In both cases Employee Role Allowed is same “ESS”

the condition works if I put only one of the two cadres i.e.
doc.cadre == ‘Group Chief’

but it doesn’t work when i put in both the conditions:
doc.cadre == ‘Group Chief’ or ‘Unit Head’

Can someone advise how to please fix this condition?