diff --git a/PLATYPUS Grammar Specification.md b/PLATYPUS Grammar Specification.md
index ad9b3c7..82105ea 100644
--- a/PLATYPUS Grammar Specification.md	
+++ b/PLATYPUS Grammar Specification.md	
@@ -6,247 +6,247 @@
 
 ### 2.1 Input Elements and Tokens
 ```
-    <input character> ->
-        ASCII characters but not SEOF
+<input character> ->
+    ASCII characters but not SEOF
 
-    <input> ->
-        <input elements> SEOF
+<input> ->
+    <input elements> SEOF
 
-    <input elements> ->
-        <input element> | <input elements> <input element>
+<input elements> ->
+    <input element> | <input elements> <input element>
 
-    <token> ->
-        <variable identifier> | <keyword> | <floating-point literal>
-        | <integer literal> | <string literal> | <separator> | <operator>
+<token> ->
+    <variable identifier> | <keyword> | <floating-point literal>
+    | <integer literal> | <string literal> | <separator> | <operator>
 ```
 ### 2.2 White Space
 ```
-    <white space> ->
-        ASCII SP character (space)
-        | ASCII HT character (horizontal tab)
-        | ASCII VT character (vertical tab)
-        | ASCII FF character (form feed)
-        | <line terminator>
-    
-    <line terminator> ->
-        CR | LF | CR LF
+<white space> ->
+    ASCII SP character (space)
+    | ASCII HT character (horizontal tab)
+    | ASCII VT character (vertical tab)
+    | ASCII FF character (form feed)
+    | <line terminator>
+
+<line terminator> ->
+    CR | LF | CR LF
 ```
 ### 2.3 Comments
 ```
-    <comment> ->
-        !< <opt_characters in line> <line terminator>
+<comment> ->
+    !< <opt_characters in line> <line terminator>
 
-    <characters in line> ->
-        <comment character> | <characters in line> <comment character>
+<characters in line> ->
+    <comment character> | <characters in line> <comment character>
 
-    <comment character> ->
-        <input character> but not <line terminator>
+<comment character> ->
+    <input character> but not <line terminator>
 ```
 ### 2.4 Variable Identifiers
 ```
-    <variable identifier> ->
-        <arithmetic variable identifier> | <string variable identifier>
+<variable identifier> ->
+    <arithmetic variable identifier> | <string variable identifier>
 
-    <arithmetic identifier> ->
-        <letter> <opt_letters or digits>
+<arithmetic identifier> ->
+    <letter> <opt_letters or digits>
 
-    <letters or digits> ->
-        <letter or digit> | <letters or digits> <letter or digit>
-    
-    <letter> -> one of
-        [a-z][A-Z]
+<letters or digits> ->
+    <letter or digit> | <letters or digits> <letter or digit>
 
-    <letter or digit> -> one of
-        [a-z][A-Z][0-9]
+<letter> -> one of
+    [a-z][A-Z]
 
-    <string variable identifier> ->
-        <arithmetic variable identifier># 
+<letter or digit> -> one of
+    [a-z][A-Z][0-9]
+
+<string variable identifier> ->
+    <arithmetic variable identifier># 
 ```
 ### 2.5 Keywords
 ```
-    <keyword> ->
-        PLATYPUS | IF | THEN | ELSE | USING | REPEAT | INPUT | OUTPUT
+<keyword> ->
+    PLATYPUS | IF | THEN | ELSE | USING | REPEAT | INPUT | OUTPUT
 ```
 ### 2.6 Integer Literals
 ```
-    <integer literal> ->
-        <decimal integer literal> | <octal integer literal>
-    
-    <decimal integer literal> ->
-        0 | <non-zero digit> <opt_digits>
+<integer literal> ->
+    <decimal integer literal> | <octal integer literal>
 
-    <digits> ->
-        <digit> | <digits> <digit>
+<decimal integer literal> ->
+    0 | <non-zero digit> <opt_digits>
 
-    <digit> ->
-        0 | <non-zero digit>
-    
-    <non-zero digit> -> one of
-        [1-9]
+<digits> ->
+    <digit> | <digits> <digit>
 
-    <octal integer literal> ->
-        0 <octal digit> <octal digits>
+<digit> ->
+    0 | <non-zero digit>
+
+<non-zero digit> -> one of
+    [1-9]
+
+<octal integer literal> ->
+    0 <octal digit> <octal digits>
+
+<octal digit> ->
+    0 | 1 | 2 | 3 | 4 | 5 | 6 | 7
+
+<octal digits> ->
+    <octal digit> | <octal digits> <octal digit>
 
-    <octal digit> ->
-        0 | 1 | 2 | 3 | 4 | 5 | 6 | 7
-    
-    <octal digits> ->
-        <octal digit> | <octal digits> <octal digit>
-    
 ```
 ### 2.7 Floating-point Literals
 ```
-    <floating-point literal> ->
-        <decimal integer literal> . <opt_digits>
+<floating-point literal> ->
+    <decimal integer literal> . <opt_digits>
 ```
 ### 2.8 String Literals
 ```
-    <string literal> ->
-        "<opt_string characters>"
+<string literal> ->
+    "<opt_string characters>"
 
-    <string chacters> ->
-        <input character> | <string characters> <input character>
+<string chacters> ->
+    <input character> | <string characters> <input character>
 ```
 ### 2.9 Separators
 ```
-    <separator> -> one of
-        ( ) { } , ; " .
+<separator> -> one of
+    ( ) { } , ; " .
 ```
 ### 2.10 Operators
 ```
-    <operator> ->
-        <arithmetic operator> | <string concatenation operator>
-        | <relational operator> | <logical operator>
-        | <assignment operator>
-    
-    <arithmetic operator> -> one of
-        + - * /
-    
-    <string concatenation operator> -> one of
-        > < == <>
+<operator> ->
+    <arithmetic operator> | <string concatenation operator>
+    | <relational operator> | <logical operator>
+    | <assignment operator>
 
-    <logical operator> ->
-        .AND. | .OR.
+<arithmetic operator> -> one of
+    + - * /
 
-    <assignment operator> ->
-        =
+<string concatenation operator> -> one of
+    > < == <>
+
+<logical operator> ->
+    .AND. | .OR.
+
+<assignment operator> ->
+    =
 ```
 ## 3. The PLATYPUS Syntatic Specification
 ### 3.1 PLATYPUS Program
 ```
-    <program> ->
-        PLATYPUS {<opt_statements>} SEOF
-    
-    <statements> ->
-        <statement> | <statements> <statement>
+<program> ->
+    PLATYPUS {<opt_statements>} SEOF
+
+<statements> ->
+    <statement> | <statements> <statement>
 ```
 ### 3.2 Statements
 ```
-    <statement> ->
-        <assignment statement>
-        | <selection statement>
-        | <iteration statement>
-        | <input statement>
-        | <output statement>
+<statement> ->
+    <assignment statement>
+    | <selection statement>
+    | <iteration statement>
+    | <input statement>
+    | <output statement>
 ```
 ### 3.3 Assignment Statement
 ```
-    <assignment statement> ->
-        <assignment expression>
+<assignment statement> ->
+    <assignment expression>
 
-    <assignment expression> ->
-        AVID = <arithmetic expression>
-        | SVID = <string expression>
+<assignment expression> ->
+    AVID = <arithmetic expression>
+    | SVID = <string expression>
 ```
 #### 3.2.2 Selection Statement (`if` statement)
 ```
-    <selection statement> ->
-        IF (<conditional expression>) THEN <statements>
-        ELSE {<opt_statements>};
+<selection statement> ->
+    IF (<conditional expression>) THEN <statements>
+    ELSE {<opt_statements>};
 ```
 #### 3.2.3 Iteration Statement (the loop statement)
 ```
-    <iteration statement> ->
-        <TBC>
+<iteration statement> ->
+    <TBC>
 ```
 #### 3.2.4 Input Statement
 ```
-    <input statement> ->
-        INPUT (<variable list>);
-    
-    <variable list> ->
-        <variable identifier> | <variable list>,<variable identifier>
+<input statement> ->
+    INPUT (<variable list>);
+
+<variable list> ->
+    <variable identifier> | <variable list>,<variable identifier>
 ```
 #### 3.2.5 Output Statement
 ```
-    <output statement> ->
-        <TBC>
+<output statement> ->
+    <TBC>
 ```
 ### 3.3 Expressions
 #### 3.3.1 Arithmetic Expressions
 ```
-    <arithmetic expression> ->
-        <unary arithmetic expression>
-        | <additive arithmetic expression>
+<arithmetic expression> ->
+    <unary arithmetic expression>
+    | <additive arithmetic expression>
 
-    <unary arithmetic expression> ->
-        - <primary arithmetic expression>
-        | + <primary arithmetic expression
+<unary arithmetic expression> ->
+    - <primary arithmetic expression>
+    | + <primary arithmetic expression
 
-    <additive arithmetic expression> ->
-        <additive arithmetic expression> + <multiplicative arithmetic expression>
-        | <additive arithmetic expression> - <multiplicative arithmetic expression>
-        | <multiplicative arithmetic expression>
-    
-    <multiplicative arithmetic expression> ->
-        <multiplicative arithmetic expression> * <primary arithmetic expression>
-        | <multiplicative arithmetic expression> / <primary arithmetic expression>
-        | <primary arithmetic expression>
+<additive arithmetic expression> ->
+    <additive arithmetic expression> + <multiplicative arithmetic expression>
+    | <additive arithmetic expression> - <multiplicative arithmetic expression>
+    | <multiplicative arithmetic expression>
 
-    <primary arithmetic expression> ->
-        <variable identifier>
-        | <floating-point literal>
-        | <integer literal>
-        | (<arithmetic expression>)
+<multiplicative arithmetic expression> ->
+    <multiplicative arithmetic expression> * <primary arithmetic expression>
+    | <multiplicative arithmetic expression> / <primary arithmetic expression>
+    | <primary arithmetic expression>
+
+<primary arithmetic expression> ->
+    <variable identifier>
+    | <floating-point literal>
+    | <integer literal>
+    | (<arithmetic expression>)
 ```
 #### 3.3.2 String Expression
 ```
-    <string expression> ->
-        <primary string expression>
-        | <string expression> << <primary string expression>
+<string expression> ->
+    <primary string expression>
+    | <string expression> << <primary string expression>
 
-    <primary string expression> ->
-        <string variable identifier>
-        | <string literal>
+<primary string expression> ->
+    <string variable identifier>
+    | <string literal>
 ```
 #### 3.3.3 Conditional Expression
 ```
-    <conditional expression> ->
-        <logical OR expression>
+<conditional expression> ->
+    <logical OR expression>
 
-    <logical OR expression> ->
-        <TBC>
+<logical OR expression> ->
+    <TBC>
 
-    <logical AND expression> ->
-        <TBC>
+<logical AND expression> ->
+    <TBC>
 ```
 #### 3.3.4 Relational Expression
 ```
-    <relational expression> ->
-        <primary a_relational expression> == <primary a_relational expression>
-        | <primary a_relational expression> <= <primary a_relational expression>
-        | <primary a_relational expression> > <primary a_relational expression>
-        | <primary a_relational expression> < <primary a_relational expression>
-        | <primary s_relational expression> == <primary s_relational expression>
-        | <primary s_relational expression> <= <primary s_relational expression>
-        | <primary s_relational expression> > <primary s_relational expression>
-        | <primary s_relational expression> < <primary s_relational expression>
-    
-    <primary a_relational expression> ->
-        <floating-point literal>
-        | <integer literal>
-        | <variable identifier>
+<relational expression> ->
+    <primary a_relational expression> == <primary a_relational expression>
+    | <primary a_relational expression> <= <primary a_relational expression>
+    | <primary a_relational expression> > <primary a_relational expression>
+    | <primary a_relational expression> < <primary a_relational expression>
+    | <primary s_relational expression> == <primary s_relational expression>
+    | <primary s_relational expression> <= <primary s_relational expression>
+    | <primary s_relational expression> > <primary s_relational expression>
+    | <primary s_relational expression> < <primary s_relational expression>
 
-    <primary s_relational expression> ->
-        <TBC>
+<primary a_relational expression> ->
+    <floating-point literal>
+    | <integer literal>
+    | <variable identifier>
+
+<primary s_relational expression> ->
+    <TBC>
 ```
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