Definition: In this task, you need to remove all words of a given length in the sentence. The number of letters in a word determine its length, for example, the length of the word "apple" is 5.
Input: Sentence: 'this sepiatoned photograph was taken in the kitchen workroom of an establishment where there are several employees including children'. Remove all words of length '7' in the given sentence.

this sepiatoned photograph was taken in the workroom of an establishment where there are employees including children