When you want to refer to something that is present in every unit or element of a group, the phrase "contained in each" can be helpful. However, if you want to avoid repetition or find a variation in your vocabulary, you can use synonyms such as "included in every," "found in each," "comprised in all," "existing in every," or "part of every." Other alternatives could be "constituting each," "embodied in all," "integrally linked in each," or "inherent in every." Using different expressions can make your writing more diverse and engaging, providing context and nuance.