is different so is different than mine is different today is different too is different when is differentiable is differential is differentiated is differentiation is differently is difficult is difficult and costly is difficult and expensive is difficult due is difficult enough is difficult even is difficult for me is difficult for people is difficult for us is difficult for you is difficult or impossible is difficult to accept is difficult to access is difficult to achieve is difficult to answer is difficult to apply is difficult to assess is difficult to believe is difficult to break is difficult to calculate is difficult to classify is difficult to comprehend is difficult to control is difficult to deal is difficult to define is difficult to describe is difficult to diagnose is difficult to distinguish is difficult to evaluate is difficult to explain is difficult to express is difficult to get is difficult to give is difficult to handle is difficult to imagine is difficult to know is difficult to know what is difficult to learn is difficult to maintain is difficult to make is difficult to manage is difficult to measure is difficult to move is difficult to obtain is difficult to overcome is difficult to pin is difficult to predict is difficult to produce is difficult to prove is difficult to quantify is difficult to reach is difficult to read is difficult to reconcile is difficult to remove is difficult to say is difficult to treat is difficult to understand is difficult to use is difficult when is difficulty is diffuse is diffused is diffusion is digested is digger is digging is digital is digital marketing is digital transformation is digitally is digitized is dignified is dignity is dilapidated is dilated is diligent is diluted is diluted with water is dim is dimensionally is dimensionless is dimethyl is dimethylamino is dimethylformamide is diminished is diminishing is dimitri is dimmed is dina