I've tried implementing this into my formula, as below but it doesn't seem to be working
=IF(D25="",IF(ISNA(INDEX(ArrayOne,MATCH(C25,ArrayTwo,0),0)),INDEX(ArrayOne,MATCH(C25,ArrayTwo,0),1),INDEX(ArrayOne,MATCH(C25,ArrayTwo,0),0)),IF(ISNA(INDEX(ArrayOne,MATCH(D25,ArrayTwo,0),0)),INDEX(ArrayOne,MATCH(D25,ArrayTwo,0),1),INDEX(ArrayOne,MATCH(D25,ArrayTwo,0),0)))
ArrayOne refers to:
=CHOOSE({1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30,31,32,33,34,35,36,37,38,39,40,41,42,43,44,45,46,47,48,49,50,51,52,53,54,55,56,57,58,59},a,b,d,e,f,g,h,i,j,k,l,m,n,o,p,q,s,t,u,v,w,x,y,z,aa,ab,ac,ad,ae,af,ag,ah,ai,aj,al,am,an,ao,ap,aq,ar,as,at,au,av,aw,ax,ay,az,ba,bb,bc,bd,be,bf,bg,bh,bi,bj)
Where all letters are named ranges,
ArrayTwo refers to:
=CHOOSE({1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30,31,32,33,34,35,36,37,38,39,40,41,42,43,44,45,46,47,48,49,50,51,52,53,54,55,56,57,58,59,60},***************************************)
where ***=60 named ranges
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