R, 42 bytes

for	(i in	 1:50) write(c(i*+2- 1,	"E"),1 ) 

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Includes a few tabs instead of spaces. Uses newlines as separators.

cat and print are unusable, but luckily write is OK. I had to resort to i*+2 -1 instead of i*2-1 to keep the alternation.