diff --git a/1-introduction/introduction/introduction.tex b/1-introduction/introduction/introduction.tex
index 896fe53..8eef1f9 100644
--- a/1-introduction/introduction/introduction.tex
+++ b/1-introduction/introduction/introduction.tex
@@ -219,7 +219,7 @@ It is therefore unclear to what extent the real and virtual visuo-haptic sensati
 
 Touching, grasping and manipulating \VOs are fundamental interactions for \AR~\cite{kim2018revisiting}, \VR~\cite{bergstrom2021how} and VEs in general~\cite{laviola20173d}.
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-As the hand is not occupied or covered with a haptic device to not impair interaction with the \RE, as described in the previous section, one can expect a a seamless and direct manipulation of the hand with the virtual content as if it were real.
+As the hand is not occupied or covered with a haptic device to not impair interaction with the \RE, as described in the previous section, one can expect a seamless and direct manipulation of the hand with the virtual content as if it were real.
 %
 Thus, augmenting a tangible object has the advantage of physically constraining the hand, allowing for easy and natural interaction, but manipulating a purely \VO with the bare hand can be challenging without good haptic feedback~\cite{maisto2017evaluation,meli2018combining}. %, and one will rely on visual and haptic feedback to guide the interaction.