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Example of _OP_DECREMENT
Code
<_data >
	<blah >5</blah>
	<alphe >letters</alphe>
</_data>

# foo := 4 #

# -- foo #
# -- blah #
# -- alphe #
# -- ping #

# foo #
# blah #
# alphe #
# ping #
Output

3
4
-1
-1

3
4
-1
-1
Ref

x.6701

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