# define some textab blocks
first_block = TexRow(c(1,2))
first_block
second_block = TexRow(3)
second_block
third_block = TexRow(4)
third_block
# concatenate two blocks vertically
first_block + second_block
# concatenate three blocks vertically
first_block + second_block + third_block
# concatenate both horizontally and vertically
# note: horizontal concatenation takes precedence over vertical concatenation
first_block + second_block / third_block
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