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Default sum every nth cell in a row

Hi

I am trying to adapt Bob Phillips formula

=SUMPRODUCT((B2:B32)*(MOD(ROW(B2:B32)-ROW(B2),n)+1=m))

I have cells, e5,e6,e7,e8,e9,e10,e11,e12,e13,e14,e15, etc
I want to sum, e5,e9,e13 etc
I will need to adapt this in another cell to add, e6,e10,e14 etc and
therefore need to understand the N + M value

I have entered the formula below in cell c5, but get 0. Have entered as
array formula
{=SUMPRODUCT((E5:AY5)*(MOD(ROW(E5:AY5)-ROW(B2),4)+1=F5))}

What am I doing wrong

Help appriciated

Brian

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