deletions | additions       diff --git a/A_contactless_interaction_is_the__.tex b/A_contactless_interaction_is_the__.tex  index b562d41..ebcc361 100644  --- a/A_contactless_interaction_is_the__.tex  +++ b/A_contactless_interaction_is_the__.tex 
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A contactless interaction is the The  simplest form of collaboration, participation is a contactless interaction,  typically involving in associated to the shared task, it involves  an exchange of information or commands implicitly associated to the shared task. implicitly.  The collaboration request can be communicated correspond  using gestures, vocal commands, or a combination of the two. When the human request is done with a gesture user performs gestures  (e.g., hand waving in waving),  the presented experiments), his/her user's  collaborative part is the one used utilized  for the gesture. user's gestures.  If voice were used, used by the user (e.g., 'follow the right hand'),  the collaborative part can be expressed in the vocal command(e.g., 'follow the right hand’)  or combined with the gesture (e.g., 'follow the hand’, right hand',  showing the right hand) as seen illustrated  in Figure 18. 18