Stall strips are put on the leading edge of an aircraft wing is designed and placed to prevent an abrupt wing-tip stall, but instead to allow any stall to move gradually out from the fuselage to the wing tip.
If a wing has a more tapered planform the stall is more prone to occur nearer to the wingtips. Wing washout (were there wing angle of incidence is higher at the root) or stall strips are therefore used to make sure that the stall starts at the root.
  
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