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1) umask will create a default mask... it will not make you files executable for you...
2) the umask you want is 007...
when you create a new file with that mask you will see it set as...

A="Hello "
B="Hello"
echo "$A$B"

In echo, to preserve white-space contained in the variable value, you need to enclose the variable evaluation in double quotes. Didn't you read what rdrtx1 suggested?

A="Hello "
B="Hello"
echo "${A}${B}"
Hello Hello