diff --git a/doodle-formats/src/format/opentype.rs b/doodle-formats/src/format/opentype.rs
index f6f5bc21..0d02b95f 100644
--- a/doodle-formats/src/format/opentype.rs
+++ b/doodle-formats/src/format/opentype.rs
@@ -2465,54 +2465,51 @@ pub fn main(module: &mut FormatModule, base: &BaseModule) -> FormatRef {
                     ),
                 ])
             };
-            let sequence_context_format1 = {
+            let sequence_context_format1 = |table_start: Expr| {
                 record([
-                    ("table_start", pos32()),
                     (
                         "coverage",
-                        offset16(var("table_start"), coverage_table.call(), base),
+                        offset16(table_start.clone(), coverage_table.call(), base),
                     ),
                     ("seq_rule_set_count", base.u16be()),
                     (
                         "seq_rule_sets",
                         repeat_count(
                             var("seq_rule_set_count"),
-                            offset16(var("table_start"), rule_set.clone(), base),
+                            offset16(table_start, rule_set.clone(), base),
                         ),
                     ),
                 ])
             };
-            let sequence_context_format2 = {
+            let sequence_context_format2 = |table_start: Expr| {
                 record([
-                    ("table_start", pos32()),
                     (
                         "coverage",
-                        offset16(var("table_start"), coverage_table.call(), base),
+                        offset16(table_start.clone(), coverage_table.call(), base),
                     ),
                     (
                         "class_def",
-                        offset16(var("table_start"), class_def.call(), base),
+                        offset16(table_start.clone(), class_def.call(), base),
                     ),
                     ("class_seq_rule_set_count", base.u16be()),
                     (
                         "class_seq_rule_sets",
                         repeat_count(
                             var("class_seq_rule_set_count"),
-                            offset16(var("table_start"), rule_set, base),
+                            offset16(table_start, rule_set.clone(), base),
                         ),
                     ),
                 ])
             };
-            let sequence_context_format3 = {
+            let sequence_context_format3 = |table_start: Expr| {
                 record([
-                    ("table_start", pos32()),
                     ("glyph_count", base.u16be()),
                     ("seq_lookup_count", base.u16be()),
                     (
                         "coverage_tables",
                         repeat_count(
                             var("glyph_count"),
-                            offset16(var("table_start"), coverage_table.call(), base),
+                            offset16(table_start, coverage_table.call(), base),
                         ),
                     ),
                     (
@@ -2524,15 +2521,16 @@ pub fn main(module: &mut FormatModule, base: &BaseModule) -> FormatRef {
             module.define_format(
                 "opentype.common.sequence_context",
                 record([
+                    ("table_start", pos32()),
                     ("format", base.u16be()),
                     (
                         "subst",
                         match_variant(
                             var("format"),
                             [
-                                (Pattern::U16(1), "Format1", sequence_context_format1),
-                                (Pattern::U16(2), "Format2", sequence_context_format2),
-                                (Pattern::U16(3), "Format3", sequence_context_format3),
+                                (Pattern::U16(1), "Format1", sequence_context_format1(var("table_start"))),
+                                (Pattern::U16(2), "Format2", sequence_context_format2(var("table_start"))),
+                                (Pattern::U16(3), "Format3", sequence_context_format3(var("table_start"))),
                                 (Pattern::Wildcard, "BadFormat", Format::Fail),
                             ],
                         ),
diff --git a/generated/sample_codegen.rs b/generated/sample_codegen.rs
index 3429214a..8e529f45 100644
--- a/generated/sample_codegen.rs
+++ b/generated/sample_codegen.rs
@@ -327,7 +327,7 @@ distance: u16
 }
 
 #[derive(Debug, Clone)]
-pub enum deflate_main_codes__dupX1 { literal(u8), reference(deflate_main_codes_reference) }
+pub enum deflate_main_codes { literal(u8), reference(deflate_main_codes_reference) }
 
 #[derive(Debug, Clone)]
 pub struct deflate_dynamic_huffman {
@@ -340,7 +340,7 @@ literal_length_distance_alphabet_code_lengths_value: Vec<u8>,
 literal_length_alphabet_code_lengths_value: Vec<u8>,
 distance_alphabet_code_lengths_value: Vec<u8>,
 codes: Vec<deflate_dynamic_huffman_codes>,
-codes_values: Vec<deflate_main_codes__dupX1>
+codes_values: Vec<deflate_main_codes>
 }
 
 #[derive(Debug, Clone)]
@@ -360,7 +360,7 @@ extra: Option<deflate_fixed_huffman_codes_values>
 #[derive(Debug, Clone)]
 pub struct deflate_fixed_huffman {
 codes: Vec<deflate_fixed_huffman_codes>,
-codes_values: Vec<deflate_main_codes__dupX1>
+codes_values: Vec<deflate_main_codes>
 }
 
 #[derive(Debug, Clone)]
@@ -369,23 +369,23 @@ align: (),
 len: u16,
 nlen: u16,
 bytes: Vec<u8>,
-codes_values: Vec<deflate_main_codes__dupX1>
+codes_values: Vec<deflate_main_codes>
 }
 
 #[derive(Debug, Clone)]
-pub enum deflate_main_codes { dynamic_huffman(deflate_dynamic_huffman), fixed_huffman(deflate_fixed_huffman), uncompressed(deflate_uncompressed) }
+pub enum deflate_main_codes__dupX1 { dynamic_huffman(deflate_dynamic_huffman), fixed_huffman(deflate_fixed_huffman), uncompressed(deflate_uncompressed) }
 
 #[derive(Debug, Clone)]
 pub struct deflate_block {
 r#final: u8,
 r#type: u8,
-data: deflate_main_codes
+data: deflate_main_codes__dupX1
 }
 
 #[derive(Debug, Clone)]
 pub struct deflate_main {
 blocks: Vec<deflate_block>,
-codes: Vec<deflate_main_codes__dupX1>,
+codes: Vec<deflate_main_codes>,
 inflate: Vec<u8>
 }
 
@@ -2285,7 +2285,6 @@ link: Option<opentype_common_sequence_context_subst_Format1_seq_rule_sets_link>
 
 #[derive(Debug, Clone)]
 pub struct opentype_common_sequence_context_subst_Format1 {
-table_start: u32,
 coverage: opentype_common_sequence_context_subst_Format1_coverage,
 seq_rule_set_count: u16,
 seq_rule_sets: Vec<opentype_common_sequence_context_subst_Format1_seq_rule_sets>
@@ -2293,7 +2292,6 @@ seq_rule_sets: Vec<opentype_common_sequence_context_subst_Format1_seq_rule_sets>
 
 #[derive(Debug, Clone)]
 pub struct opentype_common_sequence_context_subst_Format2 {
-table_start: u32,
 coverage: opentype_common_sequence_context_subst_Format1_coverage,
 class_def: opentype_gdef_table_glyph_class_def,
 class_seq_rule_set_count: u16,
@@ -2302,7 +2300,6 @@ class_seq_rule_sets: Vec<opentype_common_sequence_context_subst_Format1_seq_rule
 
 #[derive(Debug, Clone)]
 pub struct opentype_common_sequence_context_subst_Format3 {
-table_start: u32,
 glyph_count: u16,
 seq_lookup_count: u16,
 coverage_tables: Vec<opentype_common_sequence_context_subst_Format1_coverage>,
@@ -2314,6 +2311,7 @@ pub enum opentype_common_sequence_context_subst { Format1(opentype_common_sequen
 
 #[derive(Debug, Clone)]
 pub struct opentype_common_sequence_context {
+table_start: u32,
 format: u16,
 subst: opentype_common_sequence_context_subst
 }
@@ -7653,14 +7651,14 @@ PResult::Ok(opentype_common_feature_list { table_start, feature_count, feature_r
 }
 
 fn Decoder_opentype_common_sequence_context<'input>(_input: &mut Parser<'input>) -> Result<opentype_common_sequence_context, ParseError> {
-let format = ((|| PResult::Ok((Decoder24(_input))?))())?;
-let subst = ((|| PResult::Ok(match format {
-1u16 => {
-let inner = {
 let table_start = ((|| PResult::Ok({
 let inner = _input.get_offset_u64();
 ((|x: u64| PResult::Ok(x as u32))(inner))?
 }))())?;
+let format = ((|| PResult::Ok((Decoder24(_input))?))())?;
+let subst = ((|| PResult::Ok(match format {
+1u16 => {
+let inner = {
 let coverage = ((|| PResult::Ok({
 let offset = ((|| PResult::Ok((Decoder24(_input))?))())?;
 let link = ((|| PResult::Ok(match offset != 0u16 {
@@ -7778,17 +7776,13 @@ opentype_common_sequence_context_subst_Format1_seq_rule_sets { offset, link }
 }
 accum
 }))())?;
-opentype_common_sequence_context_subst_Format1 { table_start, coverage, seq_rule_set_count, seq_rule_sets }
+opentype_common_sequence_context_subst_Format1 { coverage, seq_rule_set_count, seq_rule_sets }
 };
 opentype_common_sequence_context_subst::Format1(inner)
 },
 
 2u16 => {
 let inner = {
-let table_start = ((|| PResult::Ok({
-let inner = _input.get_offset_u64();
-((|x: u64| PResult::Ok(x as u32))(inner))?
-}))())?;
 let coverage = ((|| PResult::Ok({
 let offset = ((|| PResult::Ok((Decoder24(_input))?))())?;
 let link = ((|| PResult::Ok(match offset != 0u16 {
@@ -7930,17 +7924,13 @@ opentype_common_sequence_context_subst_Format1_seq_rule_sets { offset, link }
 }
 accum
 }))())?;
-opentype_common_sequence_context_subst_Format2 { table_start, coverage, class_def, class_seq_rule_set_count, class_seq_rule_sets }
+opentype_common_sequence_context_subst_Format2 { coverage, class_def, class_seq_rule_set_count, class_seq_rule_sets }
 };
 opentype_common_sequence_context_subst::Format2(inner)
 },
 
 3u16 => {
 let inner = {
-let table_start = ((|| PResult::Ok({
-let inner = _input.get_offset_u64();
-((|x: u64| PResult::Ok(x as u32))(inner))?
-}))())?;
 let glyph_count = ((|| PResult::Ok((Decoder24(_input))?))())?;
 let seq_lookup_count = ((|| PResult::Ok((Decoder24(_input))?))())?;
 let coverage_tables = ((|| PResult::Ok({
@@ -7980,7 +7970,7 @@ accum.push((Decoder_opentype_common_sequence_lookup(_input))?);
 }
 accum
 }))())?;
-opentype_common_sequence_context_subst_Format3 { table_start, glyph_count, seq_lookup_count, coverage_tables, seq_lookup_records }
+opentype_common_sequence_context_subst_Format3 { glyph_count, seq_lookup_count, coverage_tables, seq_lookup_records }
 };
 opentype_common_sequence_context_subst::Format3(inner)
 },
@@ -7989,7 +7979,7 @@ _ => {
 return Err(ParseError::FailToken);
 }
 }))())?;
-PResult::Ok(opentype_common_sequence_context { format, subst })
+PResult::Ok(opentype_common_sequence_context { table_start, format, subst })
 }
 
 fn Decoder46<'input>(_input: &mut Parser<'input>) -> Result<(), ParseError> {
@@ -12111,26 +12101,26 @@ accum.push(elem);
 accum
 }))())?;
 let codes = ((|| PResult::Ok((try_flat_map_vec(blocks.iter().cloned(), |x: deflate_block| PResult::Ok(match x.data.clone() {
-deflate_main_codes::uncompressed(y) => {
+deflate_main_codes__dupX1::uncompressed(y) => {
 y.codes_values.clone()
 },
 
-deflate_main_codes::fixed_huffman(y) => {
+deflate_main_codes__dupX1::fixed_huffman(y) => {
 y.codes_values.clone()
 },
 
-deflate_main_codes::dynamic_huffman(y) => {
+deflate_main_codes__dupX1::dynamic_huffman(y) => {
 y.codes_values.clone()
 }
 })))?))())?;
-let inflate = ((|| PResult::Ok((try_flat_map_append_vec(codes.iter().cloned(), |tuple_var: (&Vec<u8>, deflate_main_codes__dupX1)| PResult::Ok(match tuple_var {
+let inflate = ((|| PResult::Ok((try_flat_map_append_vec(codes.iter().cloned(), |tuple_var: (&Vec<u8>, deflate_main_codes)| PResult::Ok(match tuple_var {
 (buffer, symbol) => {
 match symbol {
-deflate_main_codes__dupX1::literal(b) => {
+deflate_main_codes::literal(b) => {
 [b].to_vec()
 },
 
-deflate_main_codes__dupX1::reference(r) => {
+deflate_main_codes::reference(r) => {
 {
 let ix = (try_sub!((buffer.len()) as u32, (r.distance.clone()) as u32)) as usize;
 (slice_ext(&buffer, ix..ix + (((r.length.clone()) as u32) as usize))).to_vec()
@@ -12155,17 +12145,17 @@ let field1 = ((|| PResult::Ok((Decoder136(_input))?))())?;
 let data = ((|| PResult::Ok(match r#type {
 0u8 => {
 let inner = (Decoder_deflate_uncompressed(_input))?;
-deflate_main_codes::uncompressed(inner)
+deflate_main_codes__dupX1::uncompressed(inner)
 },
 
 1u8 => {
 let inner = (Decoder_deflate_fixed_huffman(_input))?;
-deflate_main_codes::fixed_huffman(inner)
+deflate_main_codes__dupX1::fixed_huffman(inner)
 },
 
 2u8 => {
 let inner = (Decoder_deflate_dynamic_huffman(_input))?;
-deflate_main_codes::dynamic_huffman(inner)
+deflate_main_codes__dupX1::dynamic_huffman(inner)
 },
 
 _other => {
@@ -12246,7 +12236,7 @@ let field7 = ((|| PResult::Ok((Decoder136(_input))?))())?;
 }
 accum
 }))())?;
-let codes_values = ((|| PResult::Ok((try_flat_map_vec(bytes.iter().cloned(), |x: u8| PResult::Ok([deflate_main_codes__dupX1::literal(x)].to_vec())))?))())?;
+let codes_values = ((|| PResult::Ok((try_flat_map_vec(bytes.iter().cloned(), |x: u8| PResult::Ok([deflate_main_codes::literal(x)].to_vec())))?))())?;
 PResult::Ok(deflate_uncompressed { align, len, nlen, bytes, codes_values })
 }
 
@@ -13025,7 +13015,7 @@ let codes_values = ((|| PResult::Ok((try_flat_map_vec(codes.iter().cloned(), |x:
 257u16..=285u16 => {
 match x.extra.clone() {
 Some(ref rec) => {
-[deflate_main_codes__dupX1::reference(deflate_main_codes_reference { length: rec.length.clone(), distance: rec.distance_record.distance.clone() })].to_vec()
+[deflate_main_codes::reference(deflate_main_codes_reference { length: rec.length.clone(), distance: rec.distance_record.distance.clone() })].to_vec()
 },
 
 _ => {
@@ -13039,7 +13029,7 @@ return Err(ParseError::ExcludedBranch(4350808036978594792u64));
 },
 
 _ => {
-[deflate_main_codes__dupX1::literal((x.code.clone()) as u8)].to_vec()
+[deflate_main_codes::literal((x.code.clone()) as u8)].to_vec()
 }
 })))?))())?;
 PResult::Ok(deflate_fixed_huffman { codes, codes_values })
@@ -13725,7 +13715,7 @@ let codes_values = ((|| PResult::Ok((try_flat_map_vec(codes.iter().cloned(), |x:
 257u16..=285u16 => {
 match x.extra.clone() {
 Some(ref rec) => {
-[deflate_main_codes__dupX1::reference(deflate_main_codes_reference { length: rec.length.clone(), distance: rec.distance_record.distance.clone() })].to_vec()
+[deflate_main_codes::reference(deflate_main_codes_reference { length: rec.length.clone(), distance: rec.distance_record.distance.clone() })].to_vec()
 },
 
 _ => {
@@ -13739,7 +13729,7 @@ return Err(ParseError::ExcludedBranch(4350808036978594792u64));
 },
 
 _ => {
-[deflate_main_codes__dupX1::literal((x.code.clone()) as u8)].to_vec()
+[deflate_main_codes::literal((x.code.clone()) as u8)].to_vec()
 }
 })))?))())?;
 PResult::Ok(deflate_dynamic_huffman { hlit, hdist, hclen, code_length_alphabet_code_lengths, literal_length_distance_alphabet_code_lengths, literal_length_distance_alphabet_code_lengths_value, literal_length_alphabet_code_lengths_value, distance_alphabet_code_lengths_value, codes, codes_values })
diff --git a/test-fonts/NotoSansGujarati-Regular.ttf b/test-fonts/NotoSansGujarati-Regular.ttf
new file mode 100644
index 00000000..11fe8c7f
Binary files /dev/null and b/test-fonts/NotoSansGujarati-Regular.ttf differ