First Run Index

Key First Run Index of function Run in Taskrefers to an optional integer k that defines for each function ƒⁱ, what will be the first processed elements in the input arrays contained in the Values of the Key-Value pairs specified in the corresponding cell of the column titled #VaryingInput
In the default case, each function ƒⁱ runs R times, where R is the number of elements in each of these arrays, while the first run corresponds to the arrays' first elements.
But if k is set to some greater value, ƒⁱ will run fewer times and its first run will involve processing of the kᵗʰ elements of the mentioned arrays.

Note, if k is omitted, it assumes the default value of 1.
In all cases, the total number of runs for each function ƒⁱ will also depend on the index m defined in key Last Run Index, as described in that key in more detail.