Common typos: fob21dob21dfb21dfo21dfob1dfob2sfob21ffob21efob21xfob21cfob21rfob21ddob21dgob21drob21dcob21dvob21dtob21dfpb21dfib21dflb21df9b21dfkb21df0b21dfon21dfov21dfoh21dfog21dfob11dfob31dfobw1dfobq1dfob22dfob2qdfob2wfdob21dofb21dfbo21dfo2b1dfob12sdfob21dsfob21fdfob21dffob21edfob21defob21xdfob21dxfob21cdfob21dcfob21rdfob21drfob21ddfob21dfdob21dgfob21dfgob21dfrob21dfcob21dvfob21dfvob21dtfob21dftob21dfpob21dfopb21dfiob21dfoib21dflob21dfolb21df9ob21dfo9b21dfkob21dfokb21df0ob21dfo0b21dfonb21dfobn21dfovb21dfobv21dfohb21dfobh21dfogb21dfobg21dfob121dfob211dfob321dfob231dfobw21dfob2w1dfobq21dfob2q1dfob221dfob212dfob21qdfob21wdfoob21dfobb21